-"As soon as I turned him onto using needles, he was shooting the moon and spending his every last penny on more cocaine."
All hearts are worth a point each, and the queen of spades is 13.
So you have one of two objectives in each hand: sluff off as many hearts and the Queen as possible to stay low or ... if you think you have the hand, "shoot the moon" by capturing all the hearts and the queen. If you do, each of your opponents is "assessed" 26 points. (shooting the moon)
It's a great play, but a risky one. A player looking to shoot the moon often gets all but say 1 or 2 points. So instead of his opponents being hit for 26 each, they get zero and you would eat 24 points(if another player had, say, 2 hearts)