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1.
a phrase invented at springdale high school that is a quick and easy contradiction to any phrase. it is swift and often leaves the person dazed as to how they were shot down.
person 1: so anyways this girl was all over me
person 2: doubt it

WASHINGTON - Is President Bush likely to see Al Gore’s documentary about global warming?
“Doubt it,” Bush said coolly Monday.
msnbc article, 5/24/06
by John Baranowski May 27, 2006
 
2.
disagreeing with what is said.
said with accent
p1: i have a huge dick
p2: doubt it

I fucked last night
p2: doubt it
by Anonymous October 25, 2001
 
3.
a phrase invented at springdale high school that is a quick and easy contradiction to any phrase. it is swift and often leaves the person dazed as to how they were shot down.
person 1: so anyways this girl was all over me
person 2: doubt it

WASHINGTON - Is President Bush likely to see Al Gore’s documentary about global warming?
“Doubt it,” Bush said coolly Monday.
msnbc article, 5/24/06
by John Baranowski June 01, 2006
 
4.
to extremely disagree with someone or something.
Ryan: hey dude, i just went 25 and 2 in MW3
Alec: yea, doubt it.
by diazbeballin23 December 03, 2011
 
5.
The ultimate come back. Perfect for use in arguments or for randomly injecting into conversations.
"you're gay"

"doubt it, famo!"
by Mr_Twirly November 09, 2005