2. A person who, like a showbag, is full, to the point of exploding, of shit.
One who boasts or lies - compulsively (to gain attention, popularity or impress a chick or ones mates).
Originated in the late 90s early 2000s from the kiddy show bags you buy at the Sydney Easter Show - the bags are full of lollies and cheap crap... hence... full of crap!
Location: in Osborne Park, Lane Cove on a balcony.
"I boned her last night!"
"Fuck off show bag!"
Fisherman 2: "What'd you catch?"
Fisherman 1: "Damn, it's just a showbag."
Fisherman 2: "That's a cod. Why do you call it a 'showbag'?"
Fisherman 1: "Cos it's full of shit."