That distinct feeling you get when you fall and land on something hard targeting mainly your tail bone and it feels like you are exhaling so hard that your lungs are going to implode. The pain is so extraordinary that all you can do is roll around holding your ass with both hands and making a constipated noise unable to talk or breath.
Kid board slides down a flat bar on his snowboard on a cold day and at the very end he washes out and hits his tailbone on the very edge.
Other kid: I think that kid is dying
another kid: Nah he's just getting ... (Booming Echoing Voice) THE BUTT FEELING.