Pissmark
When you piss (accidentally or purposefully) on a material with a penis at least 20 inches long. This exact measurement is compulsory so the pissmark is clearly visible to the naked eye from a great distance of at least 30 metres away. 'Pissmark' is also the definition of my Minecraft cat that I recently found in my Minecraft battery farm. He is now great friends with his fellow feline fittingly named 'Skidmark'. They now overlook in abject horror in suspended animation in my secure chest room at the various farm animals inside said battery farm as they are mercilessly cut up into yummy yummy meats and steaks for me to enjoy.
"Damn dude! I was putting on my pants this morning and there was a HUGE fucking pissmark on them from last night with Steve!"