"where are you bound (to/for) means "heading/going toward" - as in "I'm homeward bound." (I'm going home"). (the fourth definition here: http://www.thefreedictionary.com/bound).

For example: LA Bound It means that someone is on his way to Los Angeles.

I am bound to have a trip in the pole area someday . (must in the future)

I am bound for Australia to explore exotic culture and bush area . I am bound to blame her children as they made a mess in my living room .