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1.
Just like a bag that is brought at any show off poor carnival folke, it is full of shit. You call someone a showbag if they lie or say something you don't agree with
Scrim: "Hey Gav, I'm better than you at table tennis"
Gav: "As if scrim, your such a showbag"
by Gav800 August 26, 2005
 
2.
A Riverview College NSW Sydney term. either meaning:
- full of shit
- Showing off
bob: i saw Jesus the other day
john: showbag
by MW September 06, 2004
 
3.
1. Somebody who just likes to talk and talk and talk, though their words have no real meaning or basis in reality.
2. A person who, like a showbag, is full, to the point of exploding, of shit.
Those four days your mother was in town were a nightmare. That woman is such a fucking showbag, I just wanted to drive knives into my ears.
by McTurdle October 05, 2006
 
4.
Someone or something that is completely full of shit.
Code word for the boss "Showbags is on his/her way"
by Jazz Cola February 11, 2009
 
5.
"You know that hot chick that works at foodies servo?"

"yeah!"

"I boned her last night!"

"Fuck off show bag!"
by johnnygun August 21, 2009
 
6.
A title given to a person who is full of crap
person 1: i can run 100m in 7 secs
person 2: your such a show bag!
by hot_male1410 January 29, 2008
 
7.
A bottom-dwelling fish such as Carp, or more commonly Cod that is reknown for their undesirable or unpalatable flesh and/or offal.
Fisherman 1: "I've got one!"
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."
by Stefanowicz December 07, 2006