la-di-da
A fake way of saying 'I love you' when you're too lazy or too scared to say it for real.
He said 'la-di-da' instead of saying 'I love you.' I was confused and hurt.
She told me 'la-di-da' when I asked her to be my girlfriend.
He used 'la-di-da' as a substitute for 'I miss you.' It was weird.