there also happens to be a most peculiar woman rapper who hides her butters face behind large sunglasses and shares the same 'name' as this expression, whilst busta rhymes has his hand up her ass puppeteering her every move (quite literally).
Billy: Don't bullshit me, mate, I'm no fool
Jonny: No seriously, look at the ticket in my hand, I ACTUALLY did win
Billy: RAHHH DIGGGA
Jonny: Rah digga? You keep using words like that mate and you won't have a share in my winnings