That mean im overflowin all you rappin niggas in cups

from Black Cobain (Ft. Tre & Wale) – 5 AM Lyrics on Rap Genius

Meaning

Wale is saying that he’s got so much flow that he’s “overflowing”. His opposition however, is not overflowing, in fact, they’re rap game is in the cup, not flowing over the edge. The phrase, “to be in one’s cup” also means drunk.

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