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number one, number two, number three 

#1: Pee
#2: Poop
#3: Diarrhea
number one, number two, number three

Gotta go number 1. I have to take a number 2. OMG, I seriously am having #3!

Number two 

Kiddie speak for doing a poo, used so as to not to have them swearing and they're too young to use technical words like defecate.

Originates from rhyming slang, similarly number three is used for pee.
Let me know if you want to go to the toilet, you'll get a smack if you do number two in your pants.
Number two by Jazpur September 10, 2011

go number two 

To poop.
Mostly used by kids.
go number two by SanchoFromRancho September 14, 2013

Make number two 

When you squeeze out some fecal matter from your anus.
After that huge dinner I need a bathroom now so I can " make number two "
Make number two by primo box October 31, 2016

going number one and number two 

Mother was called to assist her small child in the bathroom when she was going number one and number two.