When someone says this, it means that they are warning you to bite onto a towel, because they are going to pound into one your holes, with no lube. They don't want you to be loud and start screaming because of their enormous cock.
Last night, Chris said "Bite the towel, I'm going in dry." I didn't know what he meant though..I was screaming so loud. I wish I had bitten the towel.
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.