The time people normally notice after spending an entire night playing video games.

the time right now

When you have to poop, but do it exactly at 4 in the morning. Usually when someone outside of your family or someone you are not used to, stays at your house/vice versa and you don't want to drop a deuce while they are awake

The point at which tomorrow will officially suck if you have to be conscious before 2pm for any reason. Which, sadly, most do.

the time of day when you really know you stayed up too long.

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.

To, in what is commonly a sudden outburst cause great wreckage to yours or someone else's home. Commonly involving the throwing of CDs and DVDs, spilling of soda, throwing of food, and breaking of valuables. When unplanned the event is a great stress reliever. A planned 4:00 A.M. is much less fun. DOES NOT NEED TO OCCUR AT 4:00 A.M.! Only the first one occured at this time; hence the name.