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1.
A wet fart. See air biscuit.
"That's no air biscuit that's a water biscuit" "water biscuit? more like a Whiskey Biscuit" or "Oops I crapped my pants"
by CyberDruid February 01, 2006
 
2.
a small dietry biscuit which can help you lose wieght.
The most blasphemous insult ever created.
Toby is a water biscuit.
Toby is on a diet. He is eating water biscuits. Mate
by Matt Wilmott January 10, 2006