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1.
to love someone with more passion than they love you with
boyfriend:i love you
girlfriend: i love you harder

(or vice versa, not to be confused with a sexual joke)
by fmlman October 09, 2009
 
2.
When it's more than just a regular love, When you love a person enough to cut someone open and drip candlewax into their wound all for the person you love.
Person 1: I love you.
Person 2: I love you harder.
Asshole : Haha, Person 1's a bitch.
Person 2: *grabs Asshole and throws him to the ground. He then pulls out a razor blade. Person 2 cuts that presons arm open. He then pulls out a candle and a lighter. He drips candle wax into the guys wond. Then walks away*
by uru1993 April 12, 2008