When two people hit their knuckles together (when hands are in a fist). Many times used instead of a handshake or high-five.

1. Blue Monday is the most depressing day of the year, calculated by Dr. Cliff Arnall, a researcher at the University of Cardiff's Center for Lifelong Learning.
Factors used to calculate the date included weather conditions, debt level, time since Christmas, time since failing our New Year's resolutions, low motivation and feeling the need to take action.

In 2005 the date was calculated as January 24th, in 2006 it was January 23rd, and in 2007 it was January 22nd.

2. A song by the hard rock band Orgy from their album Candy Ass.

To beat the shit out of someone or something using your bare hands

1) fight
2) step up

To hit a person with your knuckles.

A synonym to pound it. It is a fist to fist contact in a congratulatory way. Often used to replace a high 5 or shaking hands.

Short for brass knuckles.