Boxer Tyson Fury — Retires With Epic Tweet … 'Go Suck a D***' (UPDATE)

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8:28 AM PT — Well, that was quick … Fury now says the retirement post was just a joke — and he DOES plan on fighting again. 

“Hahahaha u think you will get rid of the GYPSYKING that easy,” Fury said … “I’m here to stay.”

He added, “Soon as I get better I’ll be defending what’s mine the heavyweight thrown.”It’s over for Tyson Fury — the heavyweight champ just announced his retirement in a blaze of anger … referring to the sport as a “pile of s***t” and inviting his critics to “go suck a d**k.”

As we previously reported, 28-year-old Fury pulled out of his rematch with Wladimir Klitschko after testing positive for cocaine on Sept. 22nd. 

Fury’s been taking all sorts of heat in the media — and moments ago, lashed out. 

“Boxing is the saddest thing I ever took part in, all a pile of s**t, I’m the greatest, & I’m also retired, so go suck a d**k, happy days.”

Fury hasn’t denied the cocaine allegations — in fact, he changed his Twitter avatar to put his face on Tony Montana’s body from that famous mound of coke scene from “Scarface.”