Niggas shouldn't throw stones if you live in a glass house
And if you got a glass jaw you should watch your mouth
Cause I'll break your face

from 50 Cent (Ft. Eminem) – Patiently Waiting Lyrics on Rap Genius

Meaning

Refferring to the idiom that goes “people who live in glass houses shouldn’t throw stones‘’ which means you shouldn’t criticize others for faults you have yourself.

Continuing the ‘'glass house’‘ reference, glass jaws are jaws that are easily broken. 50 won’t tolerate hypocrites talking shit about him and won’t hesitate to knock you out.

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