Top definition
The force behind Rule 34. The tendency of all things on the internet to move toward a state of more porn.
Unless energy is used to get rid of it, all things shall succumb to porntropy.
by dlmf January 02, 2009
Mug icon

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