short for wagon.
It's when a girl has a well shaped, fat ass,
especially compared to
the rest of her body's proportions.
Usually the
girls ass sticks out, pops, protrudes, arches out or perks out without them arching much or at all even.
her ass usually has some recoil too so whenever she walks and a lot of recoil when she shakes it a little, her ass jiggles, ripples and bounces.