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The day after is a way of saying something epic or terrible happened the nite before,in reference to the droping of an A-Bomb and it's undeniable impact on ones life. Here are some nites that could lead to a day after

1.Hardcore drinking nite.

2.Ending up in jail for any numerous reasons.

3.Epic sexual conquest.

4.Being on the wrong end of a beatdown.

5.Not remembering last nite at all.
dude 1: I have a killer hangover and don't rember anything about last nite.

dude 2:Ahh, The day after...
by TV CAR March 22, 2010