mediocretin 

Mediocre + cretin = mediocretin. A stupid, vulgar or insensitive person who is “additionally” of moderate or low quality, value, ability or performance.

They're so offensively average I've had to coin a new word for them: mediocretin.

mediocretin by @carrozo September 11, 2020

mediocrement

n. It's like a compliment, but not. But it's also not an insult.

3 examples of a mediocrement:

"Hey, you're not the grossest person I've ever met!"
"Well, you didn't miss ALL the pins on your last bowl."
"Here, have a participation trophy."

mediocrement by spartacusrc3 June 6, 2013

mediocredite 

The most common race of human beings known to Earth, specifically noted for their uncanny ability to remain obscenely mediocre and oblivious for the entire duration of their lives. Mediocredites tend to live in herds and are subliminally controlled by any sort of authority that can utilize and manipulate them with ease, especially advertisement agencies and government.

The government can easily manipulate the mediocredites, effectively limiting the concept of "power to the people".

mediocredite by aksival February 19, 2008