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1.
- It commonly means, "I agree with you."

- It can be a gesture of trust, "I believe in you."

- It can be a gesture of romantic love, loyalty, infatuation, "we're miles apart, but my heart is with you."

- Or a song by Canadian singer-songwriter Avril Lavigne for her debut album, Let Go.
Agreement: "Yes, yes. I hear what you're saying. I'm with you."

Infatuation: "I just met you and this is crazy, but I... I'm with you."
by dantheladysman December 17, 2012