Man I still say K-Mart's like there's an apostrophe-S on it dawg
And they say McDonald's isn't a restaurant, well I guess I'm wrong

from T.I. (Ft. Eminem) – That's All She Wrote (Original Version) Lyrics on Rap Genius

Meaning

Eminem’s roots show here because where he grew up, Detroit, K-Mart is referred to as K-Mart’s.

Furthermore, he is demonstrating his white trash background in the next line by implying that McDonald’s is a restaurant, where most of the public would deem it otherwise.

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