1. a person born in the generation following the baby boom when the birth rate fell dramatically
Synonym: baby buster
2. a person (or thing) that breaks up or overpowers something
e.g. dam buster
sanction buster
crime buster
3. a person who breaks horses
Synonym: bronco busterbroncobuster
4. a robust child
5. an informal form of address for a man
e.g. Say, fellow, what are you doing?
Hey buster, what's up?