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When you win and completely obliterate someone or something unanimously. This comes from rap battles that have 3 rounds and if someone wins all 3 rounds, the loser was 3-0d. This can be pronounced as "three-O" (the letter o) or it can be pronounced as "thirtied". Some people say three zip.
I just took a Microsoft exam. I 3-0d it.

I just raced Mike down the road and 3-0d him.
3-0 by AfricanSteam October 17, 2019
To 3 0 is to gargle one others balls. The 3 then represents the ball sack and the 0 to represent the mouth in which the 3 enters.
Joe Jonas has just had a tough day so Kevin decides to 3 0 (AUGH AUGH AUGH) Joe's balls to help Joe relax.
3 0 by TheHenster88 October 10, 2008
the third level of law-enforcement - police are known to be the 5-0, security gaurds and bouncers (club security) constitute the 4-0 - whereas the 3-0 represents school teachers or other citizens who are on the look out for people up to no good.

pronounced "three-oh"
Ay dawg, lets cut class.
No dice, the 3-0 are out in force patrolin today, we'll get busted fo sho.
3-0 by Blazin Hazen August 4, 2006
Used in the GTA Tryhard community when you 3-0 someone. Said by Gordon Ramsay.
3-0 Cry by YoungJustuss October 16, 2018
Founded by Staeni and is used when you 3-0 someone. Said by Gordon Ramsay
3-0 Cry by YoungJustuss October 16, 2018

3 0 flip 

an abbriviation for a 360 flip
3 0 flip by Talon May 31, 2004