Noun: A person assigned to dance with another person whom attract dubious and sketchy drunk guys trying to rape them on the dance floor.
Girl 1: Oh my gosh, here come those sketchy guys!!
Guy#1: I'm the designated dancer, I'll make them go away.
A friend who tells you to stop dancing when you are awkwardly and drunkenly dancing alone
I am so glad to have my designated dancer with me at parties! Now I'll never be the lone dancer freak again!