My way or the highway.

What does it mean?

I've heard once in a while an ex in the USA tell me "it's my way or freeway", meaning that I had to do whatever she wanted, or just give up our relation if I didn't like it...

If you don't do it my way, hit the road. Tell it walking. Don't let the door hit you where the Good Lord split you. Here's your hat, what's your hurry.

Along the same theme:

"If you born in the mountains, you got three choices: coal mine, moonshine, or moving on down the line." -- Lee (William Sanderson) to Doolittle (Tommy Lee Jones)
From "Coal Miner's Daughter," 1980.

See: the meaning and origin of the phrase 'my way or the highway'.