Made popular by a scene in the movie Black Sheep where Chris Farely's character is loudly heard telling the punchline. Abscence of the body of the joke in the movie led many to believe the joke did not really exist and there was only a punchline.
Little Johnnie's teacher asked him how his weekend was.
(N.) The old South Park catch phrase up until 2002, when they stopped killing Kenny and he came back from the dead through the help of Chef's parents and yet another lame Rob Schnieder movie. ("Rob Schnieder is Kenny")
To literately go Crazy on a woman, using multiple positions and ejaculating multiple times, the term kill is for when you are done and have no stamina or dexterity left in you thus killed and crazy cause well its crazy.
comes from the Latin root killcrazi or to have sex constantly
Sam: dude i went fucking Killcrazy on my bitch last night!
Bob: Shut up you Jive Turkey
Sam: i'm serious i was shooting blanks by the end