I say, "What you wanna do?" She say, "It's simple, Marcus
I wanna blow it before you put it in like a Nintendo cartridge"

from Hopsin – Ill Mind Of Hopsin 4 Lyrics on Rap Genius

Meaning

The older Nintendo games consoles used cartridges, and normally if they didn’t work, people would blow them and then try putting them in. The girl wants to suck his dick before he sticks it in her

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