The act of scouring one's home to make sure the area is completely clear of all marijuana and related paraphernalia. Often necessary when authoritative figures such as parents drop by. One must also perform a weed sweep when those ignorant of the stoner's weed smoking habits come by, such as hardcore Christian girls, and also hardcore Christian guys (though a huge stoner wouldn't be hanging out with one anyway), apartment maintenance, and other non-stoner associates.
Pimp 1: That cutie Isabel was coming over and I almost forgot to weed sweep, but I finished right before she showed up and was awarded with pussy.
Borat: HIGH FIVE!