1) a woman's bush begrudgingly offered, knowing that she will be able to use the favor to her advantage at a later time; i.e., a crabby female who allows playing in her grass now as a sacifice for a later advantage
when a guy has sex with a girl from behind a few days after shaving his pubes. leaving her Butt itchy for a few days... just like sittin on freshly cut crabgrass
remember that dyme wit the fat booty??? well i totally crabgrassed her last night.
yo man.. see that girl rubbin up against the wall??? dats my crabgrass!