Combining the words "Dude", and "Eww", when someone says something disgusting to you. Instead of saying "Eww dude" or "OMG yuckkk" etc...
Joel: I rimmed coach to get him to pick me this week. Sick.
Gary: Dewwwd, that's disgusting!
Joel: And you know his bulldog, Koko?
Gary: Please don't te....
Joel: Nah relax, I just fed it.
Gary: Oh thank God!
Joel: ...My penis.