I'm in Maison
Ah, Martin Margiela

from Jay Z (Ft. Kanye West & Rihanna) – Run This Town Lyrics on Rap Genius

Meaning

Maison Martin Margiela is a high-end fashion boutique that makes stuff like this:

maison

Jay, however, pronounces it more like “Mason” (The French word “maison” would be pronounced more like “maize-on”), presumably to fuck with the Freemason/Illuminati conspiracy theorists.

The “Ah” is crucial to this line working. It’s supposed to be a misleading line, with “I’m in mason” referencing the theories about his masonic ties, then by slipping in the “ah” he changes the meaning to say he’s actually “in” (Wearing) his clothes.

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