Alternate (read: slightly more studly) name for the man-purse, murse, messenger bag or "satchel" that straight or metroguys try to get away with carrying these days. Usually is made of canvas.
Comes from the Australian term "swag", a waterproof bedroll that foot-travelers used to roll up their possessions in for safekeeping and easy travel.
"Hey, Brett, check out Hunter's man-purse. He's such a prep."
"Naw, dude, don't you know anything? That's totally a guywag."
"What's a guywag?"
"Check urbandictionary and find out yourself, you lazy slacker."
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.