Knuckle duster mug ensures you will always look like a hard man while drinking ya brew. So you are feeling soft in the morning right? Well have a big cup of toughen up served in a knuckle duster mug. Inspired by the word ‘MUG!’, meaning 'fool' in Cockney slang, this large porcelain mug with a knuckle duster handle will ensure nobody steals your biscuits.