Panty Chum Share definition Flag when semen drips from a girl's vagina into her underwear hours after she has had sex. Sandy just had to go home and change her pants because the panty chum soaked through her thong. Panty Chum by thebiggestasshole July 6, 2011 0 0 Get merch Get the Panty Chum mug. Buy Now — $32.95 See more merch