A term with many meanings. 4 am is the time of day when shit goes down. The 4 horsemen cook their eggs, eat thier cake, pass the teapot, and cockslap bitches at 4 am. It is a time of utter chaos often resulting in wetness.
4 o'clock am.
Justyna got 4am'ed in the face.
C"mon guys Time to fuck shit up, its 4am!!!