A common expression when someone is witnessing a gross, disgusting, revolting, or generally displeasing or uncomfortable action.
1st Dude: "Not Cool," a warning to the person starting the action
Dude: Rising anger, starting to understand what is happening
3rd Dude: Total outrage
, shock at what is taking place.
: Hey, I gotta show you something...
*starts unzipping pants*
: What? Dude, DUDE, DUDE!!!