The phrase "original flick" refers to a movie or film that is unique, creative, and not a remake or based on a previous story. It is something fresh and innovative. Full definition
# 1: Safety Not Guaranteed - Take time travel and wrap a quirky indie comedy around it, and you get this awesome, hilarious and original flick starring Mark Duplass, Aubrey Plaza, Jake M. Johnson and newcomer Karan Soni. (firstshowing.net)
It should be known that I actually liked the Pang brothers original flick, although I sometimes feel a bit guilty about that given that it is also derivative to other films that were popular to the time. (qwipster.net)
While the original flick didn't dazzle, it looks pretty good compared to the limp Harold and Kumar Escape from Guantanamo Bay. (dvdmg.com)