Adjective; describing a person (usually a male) who incorrectly thinks he is far funnier, sexier, and worth more than his weight in gold. Bling usually includes many coin machine chains, a Wal-Mart clearance sale wrist watch.
"Man, Flip Simmons is triflin' every day tellin' people he's funny when he ain't even got no jokes yet. Sorry flack ass hoe!"
by 0rangeJu1ce August 15, 2017
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when someone does an act of being a complete moron.
oh man...he was such a fac flack today.
by ke55y December 9, 2010
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A bro who survives a run-in with a semtex grenade.

Flack Jacket Bro pays tribute to the use of Flak Jacket Pro to reduce explosive damage in the Modern Warfare video game series, the same series which made semtex grenade popular.
"Dude, after I jumped on that grenade for you the other night she ended up morphing into a full fledged semtex grenade. Been blowing up my phone all day. She finally quite after I answered and told her in a Spanish accent that she had the wrong number."

"Nice work, bro. Way to be rocking Flack Jacket Bro."
by nar1763 December 8, 2011
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A guy who normally acts as if he is a hardcore stoner, and makes everyone aware he is so cool and interupts everyone so they hear his side of the story.
Guy: “interrupts reader
Reader: “Hey man, chill you seem like an Ethan Flack right now”
Guy: “Sorry bro, I’m so fried right now”
by TheTurner47 May 6, 2019
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Rodney lost the bet because he is flack
Ill take my six pack on friday cuz of flack
by Flackboss October 15, 2019
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A derogatory term for someone with a peanut allergy.

Comes from the word anaphylactic shock, a possibly fatal reaction to allergens that many people with severe allergies experience.
Person 1: “That kid Caleb made me throw away my PB&J sandwich because of his peanut allergy. Now I got nothing to eat until dinner.”
Person 2: “Damn, what a flack.”
by mcraftgoodfnitebad September 6, 2021
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Omg That guy Is a Flack. Flack People Suck
by Projekt_USA November 7, 2019
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