This is used to tell someone you love them, often said to family. The first person to ever say these words was RDJ aka Iron Man/Tony Stark. And it made us cry very much... Instead of saying 'I love you!' in 2019 we say 'I love you 3000!'.
Steve:I love you 3000..
Me:*crying like a baby* Love you 2.
A word used for Keanu Reeves, who can't take a compliment, to describe him, at the end of the day the legend will compliment us back.
Fan:You are breathtaking.
Keanu:*laughs like a school girl* YOU ARE ALL BREATHTAKING...