I should've knew something was up from the jump
When I passed ma the blunt the bitch was a Steamer

from Cam'ron (Ft. Freekey Zekey) – On Fire Tonight Lyrics on Rap Genius

Meaning

He had his concerns about this girl (she might be too good to be true) When he passed her the blunt she smoked like a pro (assuming that’s what he means in reference to steamer she was blowing smoke like a steamer)

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