And I be on my green like Irish Spring and I coast
Fudge wit it and get a mouth full of soap

from Lupe Fiasco (Ft. Pharrell Williams) – I Gotcha Lyrics on Rap Genius

Meaning

Finishing the “bars” metaphor by making reference to yet another soap brand, Irish Spring. Mouth full of soap, get it? Of course you don’t; it means mouth full of bars. “On my green” refers to getting that money — which is the same colour as this brand of soap:

Mouth full of soap also refers to the parenting technique of making the child wash their mouth out with soap after they cuss. Lupe deliberately says “fudge wit it”, instead of “fuck wit it”, which a normal rapper would probably say. Although Lupe does occasionally swear in his songs, it is a lot less than most rappers, because his father did not allow swearing growing up. It wouldn’t be suprising if he told Lupe to wash his mouth out once or twice.

The “fudge wit it” is likely a reference to the movie “A Christmas Story”, particularly the scene where Ralphie says, “FUUUUUUUDGE,” (though it is implied by the film he actually swore) and received a mouth full of Life-boy.

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