n: Extremely tight sweatants worn by girls to flaunt their ass, no matter if its nice or extremely large and rumply. Said to be popular because they are "comfertable", but really its just a school appropriate way for Jr. High girls to let boys see their bum without putting forth much effort at all.
Rarely used for the actual purpose of yoga.
Boy: Hey, I noticed you are wearing yoga pants today
Girl: hehe, yeah! They are like, sooooo comfertable! Do you like them?
Boy: YES! I did enjoy the delightful view of those bongos you are smuggling. Actually, i like them so much I just jizzed in my pants a little. Please excuse me.