by Malachi Tate March 26, 2009
Something gross that mars or obscures one's view- usually on someone's glasses or on a window. Most often fingerprints, grease or mucus.
"Oh man, that kid has the most slarn on his glasses- I'm surprised he can even see" or "I can't see out my winshield because of all the slarn"
by wilbur williamforce September 18, 2006