1. a guy who acts like or is an idiot or it can be a term of affection for your guy who acts like an idiot but you still love him. It is a masculine form of twatwaffle.
That dickmuffin dumped his girl over email.
I forgave my dickmuffin for coming home drunk.
My ex was really pissed at the email I sent him, I should have put it through the dickmus test.
I really pissed off my best friend's fiance with my birthday toast- That's a good dickmus test for the best man speech.