The very pleasurable sexual act of licking another person's anus/butthole; a fancier word for rimming, a rim job, tossing salad, analingus, or just plain eating ass.
Miranda: He kind of... licked my butt.
Samantha: Be specific. Do you mean the cheeks, or...?
Miranda: It was more localized than that.
Carrie: Wait a minute. Are we... are we talking tookus lingus?
-Sex and the City Episode 54 "Baby, Talk is Cheap"
A generally satisfying female buttocks, that is well shaped, balanced and carries adequate weight in relation to her overall size; as compared to ratio.
“Gee Marvin, I never quit appreciated the fact that Marguerite always carries with her a wampus tookus that compliments her figure.”
“Good observation indeed sir. A wampus tookus that woman rightfully does carry.”
The painful, yet slightly satisfying soreness one experiences on or just below the buttocks from parking your rear end in a folding chair for the duration of the world's largest trivia contest hosted in Wisconsin each April.
As Greg stood up, he realized that he was suffering from Trivia Tookus after playing trivia for nearly 30 hours.