I'm the one that called your bluff
When your boy tried to act tough

from Wu-Tang Clan – Gravel Pit Lyrics on Rap Genius

Meaning

A play on Poker vocabularies: you were bluffing (pretending that you’d have a good hand and raising the pot) , he looked through it and called (throwing the same amount of chips into the pot like you did) and won (if he had a better hand than you).

In other words: Your boy acted though and he taught him respect.

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