According to American Dad, that's when you poop while holding hands.

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.

Slang for heroin. AKA number four heroin. Its etymology refers to the last of a 4-step purification process in which heroin is purified into a white fluffy powder.

when 2 people take a shit at the same time while holding hands!

When two friends defacate at the same time in a public restroom and hold hands under the stall.

Urinating, clearing your bowels and masturbating in the same trip to the washroom. Also referred to as a piss, shit and a wack!

a picture message that includes the sender's penis