double-dumbass 

A handy phrase meaning that the insult of being called a stupid arsehole, or (an alternative interpretation) an asinine fool, can be doubled and can be reflected back to whence it came in a way that turns a totally uncalled for insult flung at its intended target back upon its perpetrator, possibly also in a way not fully understood by its vulgarian receiver, he not being up on such things as witty retorts, or such logical insinuations as this phrase supposedly represents. However, if no other rebuffs spring to mind, in a pinch it does the job nicely.

Watch what you say to me, you double-dumbass, as I wasn’t even talking to you, I was talking to myself!

double-dumbass by Zamboozee May 17, 2011

Double dumbass on you! 

A plain,classic Star Trek phrase,delivered by the one and only Captain Kirk to a cab driver in one of the Original Series feature films.

Cab driver: Watch where you're going, you dumbass!
Captain Kirk: Double dumbass on you!

Double dumbass on you! by ChameleonAce01 June 29, 2010

Double Dipped Dumbass 

Someone who is not satisfied being merely stupid, but doubles down on it. To do two stupid things in a row.

"Did you hear about that double dipped dumbass in Florida that filmed himself driving like an idiot, causes a four-car pileup, gets injured, and while in the hospital posts the video, which the police use to arrest him?"

Double Dipped Dumbass by word burgler May 8, 2018