A name commonly used by longboarders. It describes anything and can be used as a adjective or a noun.
"GOD DAMNIT ETHAN YOU LITTILE RAT SCALLION"
by Longb0ard3r July 14, 2009
Ratscallion means doing something naughty or bad.
Megan you did not make out with that hot senior Ryan who has a girlfriend in which he fucks everyday! you Ratscallion.
by Jessica Simpson March 03, 2005