DMFK
Acronym for Dance Floor Makeout Kill. A DMFK happens when you make out on the dance floor with a baddie at the club, a wedding, etc.
Dude 1: You have a good time last night?
Dude 2: Nah but you did! I saw your DMFK
Dude 2: Nah but you did! I saw your DMFK