when taking a shit, you're on ther so long that, when you get up, the toilet rim leaves a big, oval-shaped red line around your ass.
And often leaving red ovals just above your knees from the weight of your elbows.
dude, last nite i was taking a shit for like a fuckin hour and wen i got up, i had such a massive toilet stamp
the toilet toilet stamped me.
you: i have to go to the bathroom
mom: ok, make sure not to get a toilet stamp