a picture message that includes the sender's penis
Casey sent Sloan a number 4. She has not texted him back since.
by JP Lubrano February 8, 2011
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When you take a crap, flush and wipe thinking you're done, then realize you have to go again.
"Did you go number two?"
"Nah man, I was going number 4. Stupid bastard crept up on me."
by Jesus Cornholio March 1, 2012
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there were a family of pigeons...8 to be exact. when i went on holiday i asked my mate to babysit the pigeons...she cut pigeon number fours hair into a mohican so now he looks like a hen rather than a pigeon..
if somethings good-or ok you can say 'that's pigeon number 4 that is'!
by lou December 10, 2003
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its code for when your at a party and you need to someone to check if you are armpit sweat is coming through your shirt. Or its used to tell someone that your are armpit sweat is coming through your shirt. Or can be used to explain how hot it is at a club, bar, party, and etc.
Dude 1: Am i number 4'ing?
Dude 2: How hell did you do that through two shirts.

Guy 1: There so many people at this party that its making me Number 4 up in this bitch?
Guy 2: I heard that, Old Spice 8 hr protection my ass.
by TH3 Bear January 24, 2012
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This phrase means that a person is lacking in intelligence, not through any form of retardation but a lack of trying.
Brittney: "What is an Intelligence Quotient?"
Teacher: "You mean an IQ, the thing we have been discussing for the last 10 minutes."
Friend of Brittney: "Seems like your lacking number 4."
by Andres Gonzalez February 8, 2008
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