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Someone who only has one testicle, thus the name 'Mono-Ball'.
John: Bert has a Mono-Ball!
by MaddaCheeb24 October 08, 2009
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Sep 8 Word of the Day
A casual invitation / threat used by an individual that is not afraid of fucking someone up.
PAUL: I'm going to beat your ass.

JACK: Fuck around and find out, fool!
by NX STARCHILD October 16, 2020
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2
When a persons balls havn't dropped and r still look like 1 ball
Jamie:George Olof has a monoball

Will:Lets make him cry and hide in his bathroom
by Jamie Elsworth April 30, 2005
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