Coined-usage of little sublety, typically used in a sentence for the solicitation of sex through an offer of cunnilingus, created simply by transposing the first letters or suck and cunt. Popular in college towns where old lechers who think they are clever rascals cannot resist hitting on young gals.
"Honey," he said, "can I cuck your sunt?"
Somebody is sunt when they are made fun of and get mad, or simply cannot provide a comeback.
Synonyms: salty, depressed, defeated
Rob is now sunt.