A big booty. A really nice rear end on a girl, something Sir Mix-a-Lot would want to hit.
Like 'dumps' but snoopafied.
"Yo man that girl has mad diznumps!"
"That trick that was all up on me in the club had diznumps yo"
"Stick girls are wack, I need a woman with some serious diznumps"
"Bobby, you know me, I like a girl with diznumps, and she's got them!"