1. punce (noun)
a person who is naturally very poor at something:
2. puncist (noun)
a person who purposefully and deliberately does something poorly, but is actually good at it:
the act of deliberately doing something poorly:
1. "You punce, you'll never be good at singing!" or "He's a punce, he can't do anything well."
2. "British star Les Dawson was an accompished pianist, but had a comedy performance of hitting incorrect notes. He was a puncist"
3. "Johnny was puncing about at playing pool so he could hustle for bigger money"