It's an ultimatum , you are basically saying : Do what I say (my way) or hit the high road... get lost... start walking away from me... don't look back... and keep going (the highway)
(Wait, I want to say it ! ... ) MY WAY OR THE HIGHWAY ! ! (It also rhymes, see? ^^ )
♫♪♫♫♪♫♪♫♪
This time I'm 'a let it all come out
This time I'm 'a stand up and shout
I'm 'a do things my way
It's my way ... My way, or the highway ♫♪♫
(Listen to Limp Bizkit song "My way"... it's funny !!! ^^ )