a) A girl that sleeps in your housemate’s bed on a regular basis. She may or may not pay rent, and she may or may not be well liked by the previously mentioned housemate. She is normally a member of a sorority.
b) A general term for a slutty girl in or from New Jersey.
Plural – Smutties
"Hey (insert housemate's name) where is your sumtty tonight?"
Man, there sure are a lot og Theta Phi Alfa smutties here tonight