Comes from the childrens nursery rhyme:
Number 1, tickle my bum
Number 2, do a big poo
Number 3, go for a wee
Number 1, tickle my bum
Number 2, do a big poo
Number 3, go for a wee
by Kellygirl March 28, 2012
Get the Number 3mug. by Jazpur September 5, 2011
Get the Number 3mug. The act of making thick in the warm / doing sex on a lady / putting your choo choo train in a womans tunnel
by ToppingPilot20 November 7, 2020
Get the Number 3mug. by Goofnut January 8, 2022
Get the Number 3mug. by Stias September 5, 2005
Get the Number 3mug. by Gerry McGee April 8, 2008
Get the Number 3mug. by MarshoT December 1, 2009
Get the Number 3mug.