The term buzzers is thought to derive from the old street slang term for a pickpocket who targeted women - a moll buzzer. Obviously batsmen steal an extra run or two while the opposition are distracted, hence the name buzzers.

Can you get 6 overthrows in cricket?

that can only happen if the fielder catches the ball midair and throws it over the boundary line before landing. if you field it normally and throw it out of the stadium, it's four.

Are overthrows extras?

In cricket, an overthrow (sometimes called a buzzer) is an additional run scored by a batsman as a result of the ball not being collected by a fielder in the centre, having been thrown in from the outfield. In theory there is therefore no limit to how many runs may be scored off a single ball. ...