to go without wearing any underwear under ones out clothes (distinguished by is being applicable to both genders as opposed to freeball which is used exclusively for males)
I do not think I could go commando on a regular basis. I could not get used to it.
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.