I second that.

A stupid way to say you back someone else's dumb idea. Like you're copying their words and thinking you're smart. It's just a fancy way to say 'Ditto' or 'I agree.'

It's like being the backup guy in a meeting. You don't have to like the idea, you just have to say you do so it gets discussed. It's the weakest form of support.

A lazy person's way of agreeing without thinking. It's like saying 'I agree' but you're too tired to actually say it properly.

You're agreeing to something, but you're doing it because you're weak and the song is stuck in your head. It's like you're agreeing to the feelings, not the idea.