Top definition
1- A vagina that has seen so much penis, that its breadth is analagous to that of the Nile river.

2- An absurdly promiscuous female.
I wouldn't recommend touching that niletwat without a biohazard suit, man.
by Batrastard April 17, 2003
Get the mug
Get a niletwat mug for your sister Jovana.