PSL

From Walkypedia!

Short for "Perverse Sexual Lust". PSL is (mostly) an ironic exaggeration, or hyperbole. It was originally used to explain the popularity of the character Joyce Brown in Roomies! before her personality was developed beyond a caricature. David Willis ran a poll asking for the readers' reasons for liking Joyce, and PSL was one of the options ([1]).

The term PSL is in common use in Walkyverse fandom. Characters, people, etc are said to "induce PSL" or be "PSL-inducing". One can "harbor PSL" (A T-shirt bearing the slogan "I Harbor Perverse Sexual Lust" was sold by Starline Multimedia, but it seems to be out of stock).

In a crossover joke, the character Dave in College Roomies From Hell!!! uses the acronym PSL for "Pouring Saliva Largely" ([2]).

Perverse Sexual Lust is also the name of an It's Walky! storyline.