British boxer Tyson Fury has told champion Wladimir Klitschko he "has as much charisma as my underpants" ahead of their world heavyweight showdown.

Tyson took trash talk to new levels when he fronted Klistchko in a media conference in Germany to promote their October fight.

It was Klitschko who asked the first question, teasing Tyson with: "How do you feel about fighting for the world heavyweight championship for the first time?"

Tyson  then dealt a verbal uppercut with: "It is my mission to rid boxing of you because you're a boring old man. You have as much charisma as my underpants."

"You're a wrinkled old man with a glass chin and I am going to make that glass explode like a bottle hitting a wall.

"I'm an American-style fighter with European fitness and that adds up to you're f*****," Fury continued in an expletive-filled tirade that was heavily reported by British media outlets.

"'I don't care about those [belts]. I don't care about money. I don't care about my legacy or going down in history.

"I just want to smash your old face and I don't give a f*** what anybody thinks because I don't give a f*** about being a role model."

When Klitschko's record was raised, noting that a win would take Klitschko to 28 world title fights, one more than the record held by Joe Louis, Fury went on the attack again.

"Are you greater than Louis, Ali, Frazier, Holmes? I think not. You've just fought bums well selected for you by your management.

"'When I look at you I'm not feared. I don't even see a big man because you're not only shorter than me, but you're light for a modern heavyweight.

"When I went to your training camp once I saw just your tired old jab-and-grab routine. I came away full of confidence. You're nothing.

"History tells that when even great heavyweights get to your age [Klitschko is 39] they go into rapid decline. It also says that old men give way to young lions like me [Fury is 26].

"You look old even though I think you've had Botox. Jab-and-grab won't be enough against me."

Klitschko kept his cool, allowing Fury to continue his vent. When the big Brit was finished, the champion simply said: "Good. Now he's being entertaining. That means the fight will be exciting. This is business."