Doing a number three is breaking wind. The number 3 even looks like a derriere.
3~
Example: Dad blamed the number 3 on the dog!
Doing a number 2 is solid waste.
Doing a number 1 is water waste.
Water = A Number 1
Earth = A Number 2
Air = A Number 3
Fire = A Number 4
Only women can do #4s until thier mid 50s.