you’reprobably 7 years old if you say this or using it to be un-funny
Person: Tell me a joke Child:Knock knock
Person: who’s there
Child: DEEZ NUTS SUSSY AMONG US BALLS
Person: i ain’t saying that you stereotypical fnf kid
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.