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1.
Half of something. Giving half of something as in "going halvsies."
The cover charge was $20, and he wasn't earning much money at his job, so I agreed to go halvsies with him.
by merry3 August 08, 2006
 
2.
Nickname for a guy who acts like an idiot, meaning he has half a brain.
That smoking hot chick ran at you naked and you still didn't have sex with her? Nice job halvsies.
by senoj August 31, 2007