Niggas moving fast gotta pump the brakes on 'em
They better pump 'em fast before I beat the brakes off 'em

from Gudda Gudda (Ft. Lil Wayne) – Small Thing To a Giant Lyrics on Rap Genius

Meaning

He has to slow people down by shooting them with a shot gun (“pump”). In turn they better away from him quickly (“pump [their legs] fast”) before he breaks their legs (“brakes,” in the sense of agility on the basketball court)

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