Top Definition
To take a piss with your trousers and underwear all the way down to your ankles. 'Big boy wees' are a humourous way to embrace the fact that some children don't know what the zipper is for, and do in fact wee like this.
Drunk guy: I'm going for a big boy wee on that tree!

Drunk guy 2: Me too, but maybe a different tree.
by Bagginski September 13, 2010
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.