In an event of someone accusing another player of hacking, the accuser will commonly type "hax"
Player1: *Kills a kid from behind a wall*
Player2: HAX! HAX! HAX! I'M REPORTING YOU!
Inexplicable luck very clearly favoring one side, or the usage of external resources to gain an advantage in a game
Me: Bruh I have flinched 10 turns in a row, talk about hax.
Opponent: How am I hacking?
Me: Never said you were. You very well might not be hacking, but you’ve clearly got better luck than me.
Opponent: Fair, but just play the game.
Me: I know, just pointing it out.
when someone is better than you, you call hax.
bob: hey mike wanna pvp?
mike: sure!
bob: *gets pwned*
bob: YOU CHEATER YOU USE HAX WTF MATE YOU CHEATED AAAAAAAAAAAAAAAA