forbidden parm is a slang for showing your smegma to a sibling
eric: tudor wanna see my forbidden parm?
tudor: ok cheers
A little shit that got popular within the porn industry and a lot of people on jerkmate deviced to do a mass in following and then he still ended up with 3 million followers
Guy 1:hey are you also unfollowing vex bolts?
Guy 2:no fuck you