Starting when you choose this Fight Club at 3rd level, you gain proficience with the Intimidation skill, if you don't already have it.

Also at 3rd level, you have mastered the art of the enraging insult. You can use a bonus action on your turn to provoke a creature within 60 feet who can see or hear you. That creature must make a Wisdom saving throw. On a failure, the creature takes your fisticuff's damage die + your Charisma modifier in psychic damage and has disadvantage on any attack rolls it makes that do not include you as a target before the start of your next turn. For any of your Piss & Vinegar features that require your opponent to make a saving throw, the saving DC is calculated as follows:

Starting at 6th level, you have a few tricks up your sleeve to even teh odds when the going gets rough. You can use each of these dirty tricks once and regain their use when you finish a short or long rest.

At 11th level, your threats and mean spirited tricks pack an extra punch. When you make a Charisma (Intimidation) ability check, you can use your reaction and spend 1 moxie point to give yourself advantage on the roll. When a creature makes a saving throw against one of your Piss & Vinegar features, you can use your reaction and spend 1 moxie point to give that roll disadvantage.

Starting at 17th level, you gain the ability to offend every creature in the room with minimal effort. When you use your Salty Salute feature, you can choose to target a number of creatures within 60 feet who can or hear you up to your level in this class instead of a single creature. You gain 1 moxie point (up to your maximum) the first time each creature targetd in this way hits you with an attack before the start of your next turn. You can use this feature again after you finish a long rest.