your mum's pitted clam Share definition Flag Your mum's pitted clam (YMPC). Can be used as a comeback to any call - You suck - Your mum's pitted clam! -Hey how's it going? -Your mum's pitted clam! your mum's pitted clam by crazygrape September 9, 2008 0 0 Get merch Get the your mum's pitted clam mug. Buy Now — $32.95 See more merch