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1.
(n) A sound coming from the butt; usually signifies a fart, but not always.

(v) To have a whistle come from your butt.
Emma just let such a huge whistlebutt go..
by omgeverythingistakenugh August 01, 2011
 
2.
(n.) usually you would use this term to refer to a fart or a particularly flatulent person.

(v) to have a whistle come from your butt (aka "rip a big one") and/or "cut the cheese"
We were sitting on the couch and Madison ripped a big one and just walked away. She walked away and Lindsey said, "what a whistlebutt!"
by everythingelseistakenugh1 August 04, 2011
 
3.
A really gassy person.
EEEUUUGH QUINT? WHAT A WHISTLEBUTT.
by lalalalalalalalalalalalala123 August 06, 2011