1)the hole in which poop comes out
2)your chum or buddy
My bung hurts.
Hey bung, wannna go bung up the car?
A paste tense version of the word bang.
Did you hear that Jeff and Amy bung last night?
I really wish I had hung her!
Person 1: how was last night
Person 2: it went well I bunged her good
I bunged your mom last night