The act of slipping a Quaalude or a roofie into a woman's drink making her pass out so that you can have sex with her.
Hey man!! Don't cosby that girl's drink.
Jeff is douche bag he cosby'd that girl drink at the party last night.
Jeff is douche bag he cosby'd that girl drink at the party last night.
by cosbybillpuddingpop July 23, 2015
Get the Cosbymug.