goats baw 

Scottish term for someone who is a complete fucking arsehole

Baw is Scots for testicle. You are effectively calling someone a goat's testicle.

Can be used in friendly and offensive contexts.

"Shut it ya goat's baw"

"Hey ya fuckin goat's baw, whit ye daein? Looking for a fight ur ye?"

goats baw by Scott T The Silver fox January 23, 2004