look up any word, like dirty sanchez:
 
1.
It means to dimiss something.
Jermaine, are u gonna go lesson?
Naa Bun Dat
by VS May 10, 2005
 
2.
it meens 4get that
boi:luv u..
gal:wat?
boi:bun dat
by Lil Gangsta Girl August 11, 2003