The Boondocks (2005)

S1E3 Guess Hoe's Coming to Dinner

Title: Who’s Joining Us for Dinner? Plot: Huey and Riley set out to prove to Grandad that his latest love interest, Cristal (named after the bubbly), is really a sex worker. Despite their efforts, Grandad remains skeptical, even as she drains his finances. The situation takes a turn when A Pimp Named Slickback arrives, exposing the reality of Cristal’s profession and confirming the boys' suspicions.