Cupfighter, a person or sports club, often a football club.
Cupfighters often perform different in their country's national cup than in their country's regular
competition and have more will, power and/or success in cup matches.
Person 1: Your club sucks! It endet 5th in the competition!
Person 2: Yes, but they have won the cup, though...
Person 1: Hmm, yeah its strange...
Person 2 I guess we are cupfighters.
Two (or more) people who fight on a group chat instead of their own personal text. Usually annoying, but can provide great entertainment to other members of the chat. They are usually good friends but can just get FIRED UP at each other.