Definitions
1.nounA thing or person which bangs, in any sense.
2.noun: A firework that makes a bang.
3.nounA woman's breast.
4.nounA sausage.
5.nounAn old, worn-out car.
6.nounA cylinder in a car."He drives a little four-banger to work."
7.nounA powerfully energetic piece of music, especially dance music.
8.noun(by extension) Any particularly good or pleasing thing.
9.nounSomeone who indulges in group sex -- see gangbang.
10.nounA member of a violent gang.
11.nounA violent person.