But I remember this, mom's would lick her finger tips
To wipe the coal out my eye before school wit her spit

from Ghostface Killah (Ft. Mary J. Blige) – All That I Got Is You Lyrics on Rap Genius

Meaning

It’s not “cold”, its “coal” — “the coal out ‘my eye” : He may mean any grime, and be using coal for that Dickensian image — but if you grew up in the 70’s or early '80’s you encountered coal all the time. We used it to keep warm. It often got on your face. And our Mom’s would wipe it from our eye just so.

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