h4x0r
A h4x0r is someone who can beat you in a game every time and probably has some kind of cheat.
In-game chat: 'That h4x0r is so good, I can’t even fight back.'
Tweet: 'Why is this guy a h4x0r, he’s just got better gear.'
DM: 'You’re a h4x0r, I got no chance.'