Definitions by Random.person.you.do.not.know.

Retardumb 

A combination of two words with similar but different meanings. If you are Retardumb, you have received a high level insult.

Person 1: you're so retardumb

Person 2: man that hurt my feelings.

Person 3: INSULTED!

Retardumb by Random.person.you.do.not.know. August 7, 2020