Cup Kiss

When you drink from someone else's cup, especially when using the same spot as the former user.

Cup kiss: two examples

Person A: Hey that's my cup!
Person B: That's ok, you're not ill, are you?

Person A: Hey that's my cup!
Person B: Eww, really?

cupfighter

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.