When a girl goes to suck your limp wiener but you are really drunk from beer so you just pee in her mouth instead
A Swedish Surprise is a great way to break up with your girlfriend, and also worth 10 points on USW
by papa moyer June 30, 2010
When sensing a couple is about to make love, the culprit hides somewhere in the room (i.e. in a closet), beating off while they perform the sex act. Just before he climaxes, he bursts out of the closet, blows it on the girl's face, and screams, "Swedish Surprise!" before making his escape from of the room/country.
"If he really takes that model home I'm totally giving them the Swedish Surprise"
by SIF_Warrior May 12, 2009