Sex so dirty and nasty that anything goes, and when its all said and done you feel like a used trick.
girl 1: How'd your date go last night?
girl 2: too good, we had dirty nasty trick sex.
girl 1: So you're too embarassed to see him again?
girl 2: Hell no, hes coming back over tonight.
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.