Greasy Nerd 

A person who spends all day playing video games and never leaving their bedroom. Therefore accumulating large amounts of grease because they don't wash.

The person who killed me on Call of Duty is a fat Greasy Nerd

Greasy Nerd by Steve Morison May 9, 2018

Nerdy, Dirty, Greasy look 

Bad hair day

Helen: You're having a nerdy, dirty, greasy look today?

Hayden: Yes.

Helen: You should work on that.

Hayden: No.

Nerdy, Dirty, Greasy look by Ereck Flowers December 22, 2014