Used to describe a female that is particularly hot.
Instead of saying " Id shag her"
Simply exclaim "Wid!"
The louder its said so that the female in question hears you, also adds points for bravery, or sheer sleazyness.
Again, this can also be used sarcasticaly, in relation to a mingin old woman, or a munter of a female/male.
Yo man I'm here on South Central on my DSL line with my 2000$ computer, talkin online cuz that's whatgangstas do! Go on the internet foo! Don't be fuckin wid me!