This occours when you are wearing a Snuggie and you pass gas. The snuggie material traps the gas ,sometimes for hours, until you get up and are surprised by the smell emitted.
by hatesdirtydancing December 31, 2010
While doing it snuggie style, the receiving end accidentally drops a "surprise", causing the upper half to scream and cry about shit leaking everywhere. Although the snuggie is warm, the warmth of feces is never warranted; therefore, it is always a "surprise".
Girl: This snuggie makes me feel so warm.. and this position is great! Except for the fact that I have to...
Boy: ...dude, you just shit on my dick!
Girl: Uh.. it must be a snuggie surprise!
Boy: ...dude, you just shit on my dick!
Girl: Uh.. it must be a snuggie surprise!
by Kervcat G February 28, 2009