I've never heard that term before what does it mean for something to get called away? In laymens terms
Options 101
A call option is the right to buy 100 shares of the underlying at or before a certain date (expiration) at a certain price. If you buy a call option, that's the position you are in. If you sell a call option, whoever is on the other end of the trade has the right to buy 100 shares from YOU at that price, at or before that date.
Now, obviously, that trade is only going to go forward if the option is "in the money", i.e. it makes no sense to exercise a $32 call option if you could simply buy the stock itself for $31; if the underlying is trading below the "strike price" of the call option then the call option is "out of the money" and if the underlying is trading above the strike price then it is "in the money".
So let's say company X shares are at $31 and I own some (let's say 100 shares ... options work in blocks of 100 shares). It's now April, and let's say the May $32 call options are trading at 50 cents. $32 is the "strike price", the third Friday in the month is "expiration".
Let's say I sell those $32 call options for 50 cents today. That 50 cents (per share) is money in my pocket. Then we let the trade ride, and see what happens.
Suppose the price wanders up and down but ends trading on Friday 15 May right where it is now, $31. It has gone nowhere. This is actually a rather high probability. It is below the strike price ($32) so the option expires worthless. I've made 50 cents a share (income) because I sold something (and I actually never had to buy it back, because it expired worthless). Whoever was on the other end of that trade ... lost everything (all 50 cents). But my net cost on those shares is now $30.50 because I paid $31 and sold 50 cents of options against them ...
Suppose the price goes down to $30.50. I break even compared to having waited until now to buy. But, I couldn't have known that was going to happen ...
Suppose the price goes down to $30. I'm in a loss position ... but only by 50 cents instead of the whole dollar.
That's if the price goes down. What if it goes up ...
If the price goes up to $31.99 (still below the strike price!) fantastic. I now own something worth $31.99 that I only paid $30.50 for.
If the price goes to $32.01 (above the strike price) then the option is now "in the money" and the shares get "called away" because I have sold the right to sell them for $32 as of expiration. This is okay, because selling something for $32 that I only paid $30.50 for is a win. Whoever is on the other end of the trade, pays the $32 to exercise the option and they also paid the 50 cents for the option in the first place. Not great on their end.
Where I lose (and the gambler on the other end of the trade wins) is if the price takes off. Let's say I misjudged how much something would take off, and it goes to $40. Obviously the option is in the money. I'm obligated to sell for $32 (remember that I paid $31 and sold the option for $0.50 so my cost was $30.50). That's a small win, but the big winner is whoever bought that option, because they can now exercise the option, buy my stock for $32, sell it for $40, and it only cost them 50 cents to do it.
Selling covered call options is (usually) a conservative income-earning position. Buying them is the gamble.
Selling UNcovered (naked) call options is a gamble (and unless you are a professional investor, you are not allowed to do it ... my account doesn't allow me to do this). In the example above, if the stock took off, but I had sold naked calls against it, I would really be in trouble, because now I would be obligated to BUY the stock for $40 to cover the short position that the forced sale at $32 at expiration would otherwise create.
Put options are the other way around, a put option is the right to sell shares at a certain price and on or before a certain date. The implications are a lot harder (for me) to understand ... and you cannot cover a position the way you can with call options ... and my simple way of dealing with this is that I simply do not mess with put options.