When I think about this scene,
I also think about all that came after it. When it first aired, it was easy to think something else may have happened. But everything after makes me think it didn't. If Eddie had made a pass, Buck would not have sworn to Tommy and Maddie that Eddie was straight. If Buck had made a pass, and Eddie was into it then, again, he would not be swearing Eddie is straight.
One possible thing that could have happened that still fits with canon, is that Buck made a pass, and Eddie rejected him. That is why Buck is so certain Eddie is straight. (If this had happened, I do think we would have seen more of Buck being awkward and embarrassed around Eddie afterward, but there is room for other interpretations.)
Another possible thing that would fit with canon, but is so trope filled and obvious, would be that something big did happen, a kiss or even sex, and they were both too drunk to remember it. That would allow for them never to mention it, and for the memories to slowly come back over time. It would mess with both their heads which actually would be entertaining. (The only glitch in that possibility is that it would have interfered with the larger plot line for that episode, Chim going missing and the wedding.)
I don't think I want anything else to have happened. I've been waiting nine years on this give or take, I don't want something that big to go on behind my back. I need to see the rubber band snap.
