Not as in "I do", but as in "Fuck yeah"
“Is that what I think it is?” Buck asked, sounding unsure and apprehensive. He was looking at the little box like it had suddenly grown teeth and was about to start biting.“Buck, I–” “Is this a fucking – Eddie, it's an engagement ring!” he said, a little hysterical.“You and Ana–” Buck rubbed a hand over his face, taking a step back. “Okay, I think I – I need to go.”“Buck, wait! It's not what you think!” Eddie said quickly, but Buck was already grabbing his jacket and heading for the door.
Or: Buck finds a ring, freaks out and Eddie finally gets the balls to propose. Sweet, sappy moments ensue.