Means "no" but is a stronger phrase than "no". It is usually used as a sign of resentment.
"Q: Wanna go to the cinema? A: Nah allow dat, that girl might be there!"
by Jason Forbes December 28, 2005
1 more definition
dont worry about it....
wanna go pictures ahhhhhhhhh allow dat
by JoAd December 09, 2004