Detailed HitTest

Hello =)

I was wondering if theres a way to do a detailed hittest…

Say i have a movie clip which is not Square, or has a bunch of dots in it , and i really wanna check if its overlapping , and not just the movie clip box thingy overlapping…
(having each segment of the big movieclip separate and testing for each one is out of the question)

How would i do that?