dude swing 

A regularly chill dude who suddenly goes into an emotional rant, usually when drinking.

a: "you know you're my best friend, right? I love u man! But why do you have to be such a dick sometimes? God, you make me so angry!"

b: "Relax with the dude swing. Just drink your beer. "

dude swing by sike moda November 16, 2009

Dude-Swing 

A quick change in behavior or feelings in a short period of time. Much like "mood-swing" but for males only.

"Hey what happened to Josh? Is he ok?"
"Probably just a dude-swing."

Dude-Swing by trumpeteer007 January 12, 2015