The act of unexpectedly kicking a female in the vagina and yelling "NARWHAL!" either before or after the kick.
This can happen suddenly while in conversation or by walking up and performing it.
This act may come from either a male or female, but males find much more joy and humor in it.
Girl: Hi Georges! How are you?
Boy: Oh hey Lisa, I'm great. How are you?
Girl: Oh I'm pretty good myse-
Boy (Unexpectedly): NARWHAL! *Kicks*
Girl 1: Oh my gosh, yesterday Noah narwhalled me! It hurt so fricking bad!
Girl 2: Oh I know! I got narwhalled by John today. He narwhalled me so hard that I was lifted off the ground and his shoe got stuck!