Very dilated anus from fisting and other perverse practices. So called because it can dilate to an irregular shape, like the mouth of a Dementor (fictional humanoid from the Harry Potter books).
Fisting is just gross and will give you a Dementor's Mouth
by Nemia December 09, 2010
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.Buy the mug
Can you define these popular missing words?