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2.
A tool used by people who's arguments do not correlate with reality to undermine opposing arguments.
Dude: God does not exist as there is no evidence to prove he exists.

Idiot: God exists as there is no evidence to disprove the existence of god.

Dude: Using your logic, there is a teapot orbitting Pluto as there is no evidence to disprove this.

Idiot: Pluto does not exist as I cannot see Pluto, you are wrong, god must exist.
by waffle March 24, 2004
 
1.
A word to describe someone or something that is difficult to understand, see or find. Can also refer to size. Negative.
Eg. "Dude, I'm over her ambiguity. I never know where I stand."

"His dimensions were all a bit ambiguous if you know what I mean..."
by tinydancer10 June 02, 2010