Four Ball 

A double banger. Police ambushing a house IE.. One bangs on the front door and one bangs on the back door.

MIKE: Fancy a FOUR BALL with her? DAVE: Yes! I'll bring up the rear.

Four Ball by Deno February 22, 2005

four-balling 

Two men riding together on the same motorcycle or scooter.

Fred: Hey man, can I get a ride on your new Harley?

Tim: No way!

Fred: Why not?

Tim: Dude, that's four-balling - and not cool, especially on a Harley!

four-balling by Pastcha July 28, 2014

four balls 

Slang with engineers and drafters for a number with four zeros in a row which is typically found in a top level assmembly drawing. Originated with the aerospace industry back in the 50s. In nerdspeak it has morphed into meaning anything that describes the big picture or the master plan.

"Bob, have you finished the four balls for the flux capacitor installation yet? The PHB is down my throat and threatening to take my stapler if it isn't done by this weekend."

"Dude, what's the four ball on backpacking to the hotsprings this weekend? Your sister coming?"

four balls by Sigmatero December 11, 2006

Four baller 

Anything that involves two men

Them two just rode her, what a four baller..

Or

One gay person says to another "up for a four baller"

Four baller by Joey1666 October 30, 2008