Someone who is very fat, ugly or ginger but that is so incredible in bed that you can't say no and keep going.
Hoo what the HELL do you think you are doing? Hmmm that actually feels really good! Are you some kind of magician? Don't stop doing those awesome tricks!
Person 1: Dude I finally became a magician!
Person 2: dude where did you learn?
Person 1: no I mean i'm 30 years old today.
Person 2: and?...
Person 1: and i'm still a virgin!
Person 2: dude, get some help..
While keeping your partner busy in the either fingering or giving a reach around you fist the person's ass and yell alakazam! It is more impressive if you wear a top hat.
When you are fucking a girl doggy style and you spit on her back and she thinks you jizzed on her so she turns around and you quickly explode on her face. Then you say magic!