Lyric discussion by iamasimpleman 

Cover art for After Hours lyrics by Velvet Underground, The

It's about escaping from the tormenting reality.

The protagonist of the song is a mediocre person who is having a tough life and cannot find someone appreciating him/her, and he/she can only escape from it when he/she is partying/hanging around at a bar.

It's a very great song because everybody in the world is living like this somehow.