Although people may think it means a cup or some shit like that, this is what you can say to someone being a dickhead and not get caught swearing in school or a place where there is people who are massive wimps. Also can be used to say fuck off you cunt but more discreat
Wait you done all the homework over lockdown? Your'e a right mug.
1.a large cup, usually cylindrical with a handle.
2.The thing Urban Dictionary wants you to buy at all times
Man: what does the word "dick" mean?
Urban dictionary: a penis, also, I see that you are a 9 year old child who asked this question because his older cousin told him this word, who still lives with his parents and grandparents, DO YOU WANT A "DICK MUG FOR YOUR AUNT MELISSA???!?!! WHICH IS CURRENTLY DYING FROM LEUKEMIA????