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In sports, when an athlete has a superlative (if he is a star) or uncharacteristically good (if he is a lesser/role player) performance. Usually applied to fantasy teams, but can be used in a general sense as well.

Synonym- blow up
Antonym- ho' out

1. The Star

Fantasy Football Player 1 (mimicking Denzel): "King Kong ain't got nothin on me!"

FFP2: "Get outta here man, I would have beaten you by at least 10 points if Adrian Peterson hadn't showed out with over 300 yards."

2. The Role Player

Fantasy Basketball Player 1: "What are you talking about, Eric Dampier gets 20 points, 10 boards, and 5 blocks all the time"

FBP2: "Quit lyin to yourself. Those numbers are Erica's biggest showout in like 10 years"

3. The Non- Fantasy Player

Stephen Curry baby--puttin Davidson on his back with a 40 point show out. How you like them apples??

4. Famous Usage

Brendan Haywood, center for the Washington Wizards, screaming in the face of 20-year-old Andray Blatche in the pregame introductions of one of Blatche's first starts:

"Show out or Ho' out!"
by ABeazy & DfromtheD-ville March 22, 2008
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To act out of character usually to get attention or because one is upset.
"You see me party with some other bitch, and you wanna show out" 50 Cent-After My Chedda
by Brittany_notyourgirl August 27, 2005
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1. To show up at a party/location when it is among many options for that night.

2. Alternate/Less Played out way of saying roll up.
guy: Where are you and that cute roomie of yours gonna be tonight?

girl: Oh, I think we're gonna be at Morgan's bday party--it's her 21st so we're all gonna be rowdy. You wanna come, it's at Old Glory?

guy: Drunk hotties? Yeah I'll definitely show out for that.
by ABeazy & DfromtheD-ville August 11, 2007
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similar to show off, but usually meaning a failed attempt to impress others.
"Yo, check out my rag chevy! Man, you just showing out."
by Andy Mack April 10, 2005
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