buster

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One that breaks up something.
• noun A broncobuster.
• noun A particularly robust child.
• noun A baby buster.
• noun Informal Fellow. Used in addressing a man or boy, especially out of annoyance.

from The Century Dictionary.

• noun In Australia, a sudden violent squall from the south.
• noun One who breaks intractable horses to the saddle; a bronco-buster.
• noun Something of extraordinary size.
• noun A roisterer.
• noun A frolic; a spree.
• noun A violent wind.

from the GNU version of the Collaborative International Dictionary of English.

• noun Slang, U.S. Something huge; a roistering blade; also, a spree.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun informal, often as a term of address A guy, fellow; a friend.
• noun A loser, uncool person.
• noun performing arts A staged fall, used in theatrical and film comedy.
• noun A person, thing, or event that breaks or overpowers someone or something, often used in compound terms, as crime buster, ballbuster, blockbuster, broncobuster.
• noun US, dated, slang Something huge.
• noun US, dated, slang A riotous, dashing young fellow.
• noun US, dated, slang A spree.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an informal form of address for a man
• noun a person who breaks horses
• noun a person (or thing) that breaks up or overpowers something
• noun a robust child
• noun a person born in the generation following the baby boom when the birth rate fell dramatically