A name used to call someone who is frustrating you or fucking up e.g. in a game of football/soccer giving the ball away. Particularly used by black people.
'RANDY YOU BUMBLESQUATT! THAT WAS RUBBISH MAN, AH NOW THEY GOT THE BALL!'
Used by Trisha in the TV Series of Bo Selecta! This Word is taken from a Jamaican Word, "bumbaclat", the english equivalent of our most violent insult ;)