I love you the mostest
When you slap 'mostest' on the end of 'I love you', you're basically saying you're the king of love and no one can beat you.
He said, I love you the mostest. She had to accept it because he looked cool doing it.
In the middle of a fight, he says I love you the mostest. She says fine, but she's still mad.
He texts her: I love you the mostest. She texts back: You're annoying, but you're still the mostest.