1. A good amount. 2. Slow, slug-like reaction to one's natural environment, thereby lacking common sense and improvisation skills. Example: 1. When Nancy's CDs finally mature, she gonna have dumb chedda for a brotha. 2. She said that she doesn't grind at clubs and you walked away? Ethan, you're so dumb. That, in all likelihood, means that she grinds at her place.
DUMB
Meaning of DUMB in English
Slang English vocab. Английский сленговый словарь. 2012