1. The second day of school when you turn everything everyone says into something perverted.
Dude 1: *eats a brownie* god this things hard
Dude 2: HA HA HA HA EWWWWWWW!!!!
Dude 1: ...pervert...*eats brownie*
Dude 1: *walking in the rain* i'm soaking wet...
Dude 2: EWWWWWWWWWWW ^_^ ha ha ha
Dude 1: ...perv...
Day in which every waking minute is spent enjoying coitus. Used most often by desperate couples seeking to have a child.
Jane: I'm ovulating, so I need to take a day off for a Sex Day with John.
John: I'm getting laid consistently for 24 hours.