Cockney rhyming slang for joker.
"Whatchya trying ta do, make me look like some sort of double yoker?" Mike Reid as Frank Butcher in Eastenders
dunkin on someone after you scuse them
"oh shit you just went yokers on that young bull"
yer yoker scheme can also be yoker langy
aye yoker toi
A Billy Yoker is a rearward facing tug-o-the-balls. One who performs a "Billy Yoker" begins by pulling their scrotum between their legs, and proceeding to tug on it and make a honking sound.
"Whah Whah" You just saw the original "Billy Yoker"!