Eldritch Augur's video: https://www.youtube.com/watch?v=IqJsfTmS73U
At the end of each boss, I do a gesture to give a very basic summary of my thoughts on the boss. Obviously, these aren't meant to be taken 100% seriously since reviewing a boss is more complicated than that, but here's a guide on what they mean for the most part
Church Bow (Female) - Best boss in the game
Respect/Deep Respect - One of the best
Hunter's Rally - Excellent boss
Wave - A good boss
Point forward - No super strong opinion
Conviction - Bad boss
Sit Down - Really bad boss