look up any word, like cleveland steamer:
 
1.
To throw up.
God Damn (excuse me lord). This nigga took a Number Four on my new carpet.
by Jyuzayeguuwaah Summers June 10, 2009
 
2.
Taken from a movie or show that i cant remember, A number four is where two people simultaneously shit together, whilst holding hands.
Gary : Me and sean did a number four together
Luke : Seriously... how?
Gary : We took a shit in the town toilets and held hands under the cubicles
Luke : Oh God.
by LukeG33 January 17, 2011