Bang a Larry

To take a left turn, usually while driving.

Slang. Typically heard near Boston.

It is not just making a left turn, it's much cooler than that.

Ex) making a left turn as soon as the light turns green and before oncoming traffic has a chance to react to the light changing to green.

Ex) turning the wheel to make a hard and fast left turn

Ex 1) Yeah, I'm just going to bang a Larry real quick and then we'll be at McDonald's."

Ex 2) Driver: "Which way are we going?"

Passenger: "Uhhh, bang a Larry."