Why my pants sag off? Cause I’m rapping my ass off

from Big Sean (Ft. Kanye West & Roscoe Dash) – Marvin & Chardonnay Lyrics on Rap Genius

Meaning

His pants gon' be on the ground if Kanye was to literally “rap his ass off.”

NOTE: This is also a line taken from Naughty By Nature’s track, “Strike A Nerve

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