I know this kid who says he knows ya because of that
Now I know where ya lay ya hat at and that's that

from Mobb Deep (Ft. Big Noyd) – Party Over Lyrics on Rap Genius

Meaning

A place where you “lay your hat” is your home, therefore Prodigy found out where you live (someone told him)…

The line also consists of internal rhyming, “hat”, “at” and “that”.

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