Women: What a SDP?
Man 1: One in the ass, one in the pussy
Man 2: Standing up, at the same time!!!! muahahahahahha
Women: Holy shit Man 1 and 2: Lets do this.......Leeeeeerrrroooooyyyyyyy Jeeeennnkkiiinnnssss
A spontaeous dance party. Usually the one who declares one does not actually intend on having one, but feels it is the appropriate thing to say. Very rarely does a SDP occur