When you’re late to an argument and you want to get involved. Eg the row is concluding and you get in a last “and have some bollocks”. Also traditionally used when the row is in a foreign language which you don’t understand
Person one: Me cago en tus dientes!
Person two: Que te jodas!
Person three: And have some bollocks!
plain&simple just have some god damn common sense.
Theres too many people around, don't throw me the ball, have some savy.