The penis in its erected state (a boner)
Mane, you give that bitch a dose of the Mega Flex?
"Hell yeah nigga. I laid some pipe like a pro!"
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A metaphorical flex where you try to assert mental dominance over others by "flexing" your brain and showcasing your knowledge. Usually done in a condescending manner.
"I'm literally starving."
"You're not literally starving, you're just hungry. If you were starving you'd be unable to talk or move."
"What a mega flex."