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1.
Refers to any tight white pants worn by a male or female, which are often see-through. These tight white pants denote that the wearer is slutty and thus, open for business. Often worn by whores and Surrey girls. Furthermore, it can refer to the person wearing them.
a) "Pssh, Stacy's got her slut pants on today". (b)"Hey there slut pants".
by Mr. Moss October 19, 2006
 
2.
May also refer to the tight black pants that some girls believe matches with everything and are usually unflattering to the girl's butt.
Cathy has no fashion sense so she's always wearing slut pants.
by The World Expert on Slut Pants November 08, 2009
 
3.
A word I ganked off Jessica.

A stupid insult which doesn't mean anything. Probably has something to do with the the insultee being a whore
Shutup Slutpants, you ate my dog.
by Clayton. May 18, 2003
 
4.
Slut pants are those plad PJ pants that people think are ok to wear in public. All it really means is the person wereing them is ready for sex. easy down easy up, perfect for quicky.
Dude1: dude you see that chick, shes totaly read for it just look at her slut pants they aleady have splouge marks on them.

Dude2: ummm....dude i made those marks
by Wise old Buck March 27, 2009