egotistical douche bag who ratts out everyone for doing anything that breaks the rules in any way; a snitch, fink, narc, squealer, tattler, weasel, double-crosser
"Oh my god! that harrel over there just ratted me out to the principal!"
"I just broke a rule and that harrel narced on me!"
A harrel, "make sure you refer to the handbook so you don't break the rules."