Green’s Dictionary of Slang

dunced out adj.

[SE dunce]

(US) dumbfounded, stupid.

[US]L. Bruce Essential Lenny Bruce 113: Completely dunced out, you know?
[US]L. Bangs in Psychotic Reactions (1988) 114: Totally meaningless, dunced-out trash.
P.A. Balaskas Silent Voices 2 119: Our focus on our stupid pop culture and its dunced-out media made it less possible for us to think our way through the post 9/11 confusion.