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a person that talks expertly about something he/she actually knows nothing about

(Defined by the NPR show This American Life)
Usually occurs in a conversation when you know a little about a subject and when asked to expand upon it, you extrapolate completely unrelated nonsense.

"What are trans fatty acids?"
"Fats that have an extra hydrogen atom on it"
"What is that bad for you?"
insert modern jackass line
by Rian D Fowler August 09, 2005
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Aug 8 Word of the Day
Pata Sucia: Spanglish; Direct translation- dirty foot; used in reference to men and women who remove their shoes in public and then proceed to walk barefooted wherever they may be; mainly found at night clubs or after being at a night club.

LADIES, YOUR STILETTOS MAY BE PAINFUL, BUT THAT IS THE CHALLENGE YOU ACCEPTED WHEN YOU PUT THEM ON. BEAUTY=PAIN
"Check out the pata sucia on that vaca. Hey tubby, put your shoes back on."
by luvmyreddog June 22, 2014
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