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!
Person 2: man that hurt my feelings.
Person 3: INSULTED!
RetarDumb
Some one or something very retarded.
That new T.V. u got is RetarDumb