Mega Flex 

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!"

Mega Flex by mtownah April 28, 2008

mega flex 

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."

mega flex by justsomeguywhoeatswaffles November 19, 2018