knuckle-up

An action akin to the high-five or the handshake. The act of touching fists knukle-to-knuckle in greeting or departure. In 2003 this action was accompanied by the phrase "knuckle-up" but has since just become the motion without the phrase. The first instance of this action and phrase was in Dallas, TX in the mid-90's and has since become a common gesture in most public forms of transit in NYC.

Jimbo-- "Is that some kind of a gang sign?"
Miguel--"Nah, that's a knuckle-up, bro."

by super steve August 31, 2005

Knuckle Up

The Act Of Whupping Someone's Ass!

BITCH All In My FACE We Bout 2 KNUCKLE UP In Did Bitch!!!

by MS. BOUNCE DAT AZZ July 12, 2006

Knuckle up

To masturbate
The act of masturbation

Guy 1: Did you see Stacey?

Guy 2: Yeah, total nipple slip! I'm totally going to knuckle up to that later

by leobaby1 November 18, 2011

Knuckle Up

When two men choose to engage in mutual masturbation, implementing a "thumb war" grip and jerking themselves off simultaneously, locked at the knuckles.

Since he had a girlfriend, the young man decided to knuckle up with a buddy.

by DaXymbiont February 07, 2018