So you gassed up, but I still eat your ass up

from Cassidy – Raid Lyrics on Rap Genius

Meaning

Meek thinks he’s better but Cass knows he can out-rap Meek. This line is somewhat reminiscent of a certain Canibus line though…

Also, gassed up means hyped up, like he mentions in the line above he’s getting his songs played everyday.

Ass is used as a homonym to set up his metaphor;
When you fart, it’s most commonly known as gas, and you fart out of your butt, which is your ass.

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