One who runs around with high energy and no real purpose. A hyperactive person.

A person who is being overly stimulated, over excited or out of control of their emotions to the point of it being obnoxious to those around them.

A person who is completely agro or out of control.
Tom: Yeah man! I can't wait to for the concert tonight, it'll be so awesome!, I can't wait, can't wait, can't wait!!

Carl: Dude, don't go getting all "Billy Barty" on my ass.
by Tsarith April 16, 2009

8 Words Related to Billy Barty

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