You just a young'un comin out, gettin gassed to run your mouth

from Yasiin Bey (Ft. Q-Tip & Tash) – Body Rock Lyrics on Rap Genius

Meaning

Other rappers are inexperienced and puttin on the “gas face” (3rd Bass reference)(things.http://www.youtube.com/watch?v=QYp28tEAVvs) to look tough and say stupid things so they can feel cool.

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