Flexin' on these niggas, I'm like Popeye on his spinach

from Meek Mill – Intro (Dreams and Nightmares) Lyrics on Rap Genius

Meaning

A reference to Popeye the Sailor, a 1930s cartoon character. Whenever Popeye was gettin' worked on by a villain, he’d shotgun some spinach, instantly get yolked as fuck, and ultimately turn the tables on the villain (see below for an example).

https://www.youtube.com/watch?v=S5A-vz8ptNU

Meek loves to Flex aka show off. So much so, that he resembles Popeye.

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