And fuck it I'm a rider
Magnum strapped tight, so I'm bustin' all insider her

from N.O.R.E. (Ft. Meek Mill & Pusha T) – Scared Money Lyrics on Rap Genius

Meaning

Double entendre here.
Which Magnum is he really using? The shoot a nigga dead Magnum? or the fuck a girl Magnum? Hmmm.

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