When engaged in sex in a doggy style position, pull out and exclaim "Oh whoops, my dick fell out." Replace yourself with a large Puerto Rican friend, and let him resume. Wait a moment, then run around in front of partner and shout "Surprise!"
Alternate names: Juan Carlos Surprise, The Sneaky Thieving Mexican.
Not to good man.. last night me and Juan did the Puerto Rican Sneak-her and she ain't to happy..