2
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.
Aunt Hazel warned cousin Charley of the dangers of doing number 4.
by J town booga December 24, 2007
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4
When two friends defacate at the same time in a public restroom and hold hands under the stall.
James: Hey Steve is that you in the stall next to me?

Steve: Yeah man.

James: Are you taking a number 2?

Steve: You bet. Are you?

James: Yeah we should hold hands and take a number 4.

Steve: Omg Yeah!
by Wannnabe55 May 21, 2009
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5
Urinating, clearing your bowels and masturbating in the same trip to the washroom. Also referred to as a piss, shit and a wack!
I was supposed to meet K Lo at the party in an hour, but I needed to make time for a number 4 — so I called her and said I'd meet her in 90 minutes.
by Phineas Taylor Barracus December 20, 2004
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