buster

(noun) an informal form of address for a man. Synonyms: fellow, dude. Examples: "Say, fellow, what are you doing?." "Hey buster, what's up?."

(noun) a robust child.

(noun) a person who breaks horses. Synonyms: bronco buster, broncobuster.

(noun) a person (or thing) that breaks up or overpowers something. Examples: "Dam buster." "Sanction buster." "Crime buster."

(noun) a person born in the generation following the baby boom when the birth rate fell dramatically. Synonyms: baby buster.