noun: the poop that collects under the finger nail, when the finger perforates the toilet paper during the act of wiping
adj: a descriptive word used to describe someone who's idiocy takes you by surprise and disgusts you
Ralph was disgusted by the ginormous turd splinter he got this morning.
Tiffany is such a turd splinter! She threw up in my car last night when I took her home from the party.