A similar idea to a Peurto Rican Shower, originally coined on the show Happy Endings, s2e16. A Whore's Bath is when you, instead of showering, rub dryer sheets on your armpits and splash water on your genitals in a lame attempt at keeping some sort of society-accepted level of hygiene and cleanliness. This usually occurs after a one night stand.
Person 1: Hey, you look pretty disgusting.
Person 2: Yeah, I know, I hooked up with some sketchy guy last night and took a Whore's Bath in the bathroom.