"Jailing"

Today in class we were talking about miss communications and today me and my roomie and suitemate went to workout. We were walking down the stairs and a guy walked by and said "hey girl you jailinn?" to my girlfriend. We all stopped for a moment looked confused and were like excuse me? so again plan as day he stated girl is you jailin? My suitemate thought he was talking about the name Jaylen and she said nope her names natalie. I thought it might have been a slang word so we googled it on the way to the gym. Google says Like lowriding but the proper name for it beacuse it started in jail when prisoners got their belts taken of them so they didnt hang themselves, so their pants hung low. Haha but heres the thing we all had yoga pants on that are tight fitting. so now the word Jailin is a joke to us and we walk around saying it in the weirdest ways.