"buster" in the noun sense
1. fellow, dude, buster
an informal form of address for a man
"Say, fellow, what are you doing?"
"Hey buster, what's up?"
a robust child
3. buster, bronco buster, broncobuster
a person who breaks horses
a person (or thing) that breaks up or overpowers something
5. baby buster, buster
a person born in the generation following the baby boom when the birth rate fell dramatically
Source: WordNet® (An amazing lexical database of English)
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