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where you put the wee wee pads on your knickers and you wee wee into them its like a nappy
Eric Partridge records this in his A Dictionary of Slang,1937, as "Wee-wee, a urination; esp. do a wee-wee" and considers it to be late 19th century.
In the Wee Wee Hours... was created in 1987.
Wee Wee Monsieur was created in 1938.
yes they wee wee on leaves
and their mums and freinds if they have any!