What is duh-duh-duh?

He say that I'm good enough, grabbin' my duh-duh-duh. Thinkin' 'bout shit that I shouldn't have (huh). So I tell him there's one of me, he makin' fun of me (ha-ha). His girl is a bum to me (grrah). Like that boy is a cap, sayin' he home but I know where he at, like Bet he blowin' her back. thinkin' 'bout me 'cause he know that ass fat. And it been what it been (uh, huh) Callin' his phone like "Yo, send me your PIN". Duckin' my shit 'cause he know what I'm on (grrah). But when he hit me I'm not gon' respond (grrah). But I don't sleep enoght without you. And I can't eat enought without you (huh). If you don't speak, does that mean we're through? (Huh). Don't like sneaky shit that you do (grrah)