Dummy Faded is a condition in which someone gets so high that they are actually becoming uunintelligent and slow because of the copious amounts of drugs or substances that they consumed
Tom: Bro I just smoked like 10 blunts now I'm "dummy faded "
when you are so high your speech begins to be slurred, you say things out of context, and you talk about random ass shit. usually when one is in a state of "dummy faded-ness" they do not have enough will power to get up and start walking
Finn: bro rebecca came over before school and we didn't even hook-up we just got high
Chuck: damn I was wondering why she was acting so dummy faded during class