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1.
half hartedly working to achieve an objective.
Many college students are half assing their way through classes.
by kalina ontriguez March 16, 2010
 
2.
When a guy during sexual intercourse rapidly goes between a girls vagina and her asshole.
Ashley was sore in two places, after Sherwood was done Half-Assing her.
by SomeoneYouProbablyDontKnow July 30, 2008