This word is a contraction of "Cupid Stunt", who was a character on the Kenny Everett Show in the 1980s. This in turn is a spoonerism of "Stupid Cunt". The expression is used by people who watched TV in the 1980s, usually to describe people who were born after show's popularity waned and are therefore unfamiliar with the expression.
after having sex with girl in the ass, pull cock out and smear poo on butt cheek in the shape of the heart #1 brown jersey. then, get the hell out of her dormroom!!
(Verb) The act of imitating the Roman god, who goes by the same name, and making people fall for someone, be it by shooting arrows or skill for getting people together.