shin split 

an injury to the lower leg that causes the muscle to detach from the bone

running incorrectly or using the wrong type of shoes can result in a shin split

shin split by Victoria January 23, 2005

shitsplit 

The act of sharting whilst sporting a g-string causing the fecal matter to become disrupted by the interfering underwear and launch forth in two separate directions.

Dude! That erotic dancer just performed a shitsplit on my lap!

shitsplit by The Jarvis February 20, 2006

Shitsplit 

Something so ball droppingly amazing that when you take to the crapper you will find to your amazement your shit has indeed been split.

Dude, Gary, did you check out E3 '08?
The Microsoft part was shitsplitting!
I had to change pants!

Shitsplit by MassaRee August 8, 2008