1. something done with little care or effort
do a half-assed job at something
To do something half-assed it means to do something with very little care or effort, usually completing the bare minimum or doing something in a sloppy or careless way. slang. A half-assed attempt or half-assed approach means to confront a problem or project with little or no care or effort. This expression is extremely informal, even vulgar and should only be used in informal situations.