What is Un-dude?
1.
being stressed or not calm. upset. super pissed off.
The Dude: Shit! Walter, you fuck... you fucked it up! You fucked it up! Her life was in our hands, man!
Walter: Nothing is fucked here, Dude. Come on, you're being very un-Dude. They'll call back.
See
2.
not being very relaxed or not laid-back; stressed
You're being very un-dude.
See