Dead on the floor.
1)Laughing so hard, you pretty much die on the floor.
2)Attempting to take a jumping photo, such as High School Musical, but you fail so much, it is dead on the floor.
Person 1: "So me and my friends tried to take a jumping photo at that party Saturday."
Person 2: "How'd that work out?"
Person 1: "Not that great. We were all dotf."
Duel of the fates.
Name of a map in Jedi Knight: Jedi Academy in the Moviebattles 2 mod.
I love DOTF, it's great for snipers.