number nine 

ninth color in crayon box.
black

sheet she's a number nine,
or he looks like the ninth color

number nine by deer killer January 20, 2009

number three 

Taking a shower immediately after dropping anchor. It's called a number three because it should ALWAYS follow a number two. If you don't agree, then here is what will convince you: If you get poop on your hand and wipe it off with a dry piece of toilet paper YOUR HAND WILL STILL SMELL LIKE POOP! (shock)

Aaron Desselle always goes home from work to take a number three. His butt is clean right now.

number three by a-diggity June 29, 2004

Number 3 

To vomit into a toilet. Typically done after a long night of drinking.

"Gross...someone's number 2 is gonna make me go number 3!"

Number 3 by MarshoT December 1, 2009

number one

Commander William T. Riker

Make it so, Number One.

number one by Captain Picard February 7, 2005

Number 2 Pussy 

Anal, The secondary pussy. Having anal sex.

The asshole of a female

Person 1 "How was Amy's last night?"
Person 2 "She finally gave it up!"
Person 1 "Pussy?"
Person 2 "Number 2 Pussy at that!"
Person 1 "You lucky motherfucker"

Number 2 Pussy by #shitmikesays September 3, 2012

Number 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!

Number 4 by Wannnabe55 May 21, 2009

Number 7

When you are violently ill and uncontrollably vomit and have explosive diarrhea simultaneously. The victim is usually unprepared and in midstride for the bathroom when it occurs. Also known as burning the candle at both ends.

"Dude, I just caught my mom and dad going at it in the car! I almost number 7'ed right there!"

"Man, I was so sick, I took a number 7 and there wasn't any warning!"
"Dude, you don't choose when to number 7, number 7 chooses you."

"I don't wanna talk about it..."

Number 7 by Tbonesteak4dinner August 19, 2011