to have sex.

used when someone says or does something stupid.
originated in shi-town at a high school on the west side called prosser career academy.

When you go from one banger to another

Hmmm lemme think ah yes it's sex but with a little twist. Now my dear children bang bang is a "slang" word for sex....ya know

In the tower industry Woop Signal system "Bang Bang" means drop a load all the way to the ground as fast as you want to. Typically a guy riding the line would give this command to the hoist operator only after he was well clear of the tower and had a clean path to ground.

Modern hydraulic hoists limit speed but the old friction hoists could drop you nearly as fast as gravity. Back in the day you only said "bang bang" if you wanted to fly to the ground at breakneck speed. Not OSHA legal, but back in the day it was a lot of fun!

Not sure but I think the term came from when you accidently dropped a load and it bounced, thus it hit the ground twice, "bang, bang".

The catchphrase of the famous Bangis Khan