Cause you can be quick, jump the candlestick, burn your back
And fuck Jill on a hill, but you still ain't Jack

from Eminem (Ft. Eye-Kyu) – 313 Lyrics on Rap Genius

Meaning

Eminem’s taunt that you “ain’t jack” references two separate nursery rhymes — “Jack be nimble, Jack be quick…” and “Jack and Jill went up a hill..”

“You aint Jack” is used to say you aint shit, you aint nothing so after all that you will still be nothing compared to Eminem.

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