Thumbass

A person who; Is exceptionally stupid, Exceptionally thumb like in appearance-Oft bald or Rectangular- or even just exceptionally annoying- usually purposefully so-.

Ex.1

“God, Greg, You seen those recent photos of Musk and Dwayne”?

“Yeah dude, They look like such thumbasses honestly.”

Ex.2
“Damnit Mark! You fucked it up you thumbass!”

“Hey its not my fault you didn’t tell me to check the pressure gage.”