Twink I’d Like To Peg.
A TILP is a twink (a young, attractive, slim, gay man) who you would like to engage in sexual intercourse with, specifically pegging (the sexual practice where a woman performs anal sex with a man, usually using a strap-on or dildo).
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.