Dumbdumb 

A person who is so dumb that you need an extra dumb on the end for it to compare with the level of dumbness they have.

That guy Sindbad is dumbdumb. he cant even count to 100.

Dumbdumb by :D :) bigman November 9, 2018

Dumbdumbloser 

Dumbdumbloser is when someone tries to put false words into sherif clicky’s mouth

Okay here’s the point; regardless of if I am sussy grandpa or not, pardon the dutch is a real phrase, i say this because I am dumbdumbloser

Dumbdumbloser by Sussyandy July 20, 2021

detrimental-dumbdumb

A person you work with who’s capacity for wisdom is so lacking that he or she costs the business more than the product of her work.

To get things done efficiently, avoid detrimental-dumbdumb as they make a mess of efficient work flow by taking conversations off into tangents, making irresponsible claims that halt projects until extra work is performed to prove them false, or forcing bottleneck approval processes.

detrimental-dumbdumb by Tysty7 June 12, 2019