To kick something aggressively. Primarily a door or person.
"Those neighbors are being annoying. BANG!"
To bang someone is the act of having sex, it is when you continuously thrash/ swing yourself towards their sexual area.
Man, my girl is so easy to bang.
a loud noise when having too much fun
we had a bang last night! it was great
To bang someone is to have sex
Yeah, mate I banged that chick piffting
When things go together
When you buy something online then try it on and it doesn't bang