A degrogatory name for another person suggesting that they are a idiot. It can be demonstrated by smacking ones left hand (whilst in a 'wanker' position) with ones right palm.
Leslie: That Trebmal's a right bellsmacker.
David: I know Leslie, he can smack bells with the best of them
David: I know Leslie, he can smack bells with the best of them
by Steve Lambert November 14, 2006