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1.
Slang term for a male acquaintance, used in a mock aggressive or openly hostile way.
Next time, Bucko, leave some toilet paper within arms reach when you've used up the roll.
by harry flashman July 25, 2003
 
2.
A generic nickname used when reffering either to a friend or a jerk, depending on the context and the tone of voice. Often times is also used when acting like a pirate in a clever or mocking manner.
You better watch it bucko!

Hey bucko, where you been?

Arr me bucko i've got meself some fine booty.
by larry says hi October 15, 2005
 
3.
Someone who is really stupid and generally inbred.
Matt you are such a bucko, nobody likes you!
by TheCurtard3000 February 27, 2014
 
4.
A nickname or term similar to "buddy." Coined in Bakersfield, California after musician Buck Owens, who often performed at the Crystal Palace Saloon.
"Get it right, bucko!"
by Bucky Boo November 23, 2007
 
5.
Somebody who isn't wanted by anybody, undereducated and generally bad at everything they do
Matthew was known as a Bucko by his classmates
by Curtard March 03, 2014
 
6.
Another word for Awesome, or cool, or tits, or basically anything positive.
Werewolf: Bucko Belated Birthday Beth!
by Theedingo1 November 09, 2011
 
7.
A pimp
pimpin them hoez bucko
by BrentMiller November 07, 2008