a girl who is butt ugly and a slut but who always tries to jump into bed with the nearest person she see's hence the "roo" like a kangaroo, that jumps all over the place. a rooskank tries to jump into having sex with you. she is a slut. a rooskank will try to force herself onto someone, normally they are not fine.
Rupert: Damn, that girl is a Rooskank !
Clive: yeah i know she is so damn ugly! she tried to jump into bed with me, practically forced herself one me!
Rupert: what? what a slut, she tried it on with me as well.
Clive: if im really desperate i'll have the Rooskank !
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.