This won't get you banned, as it is 100% clientside.

My favorite changes so far:

When you get killed by monster it says : (your character name) was buttsecksed by (monster name)

When you get killed by another player it says: (your char name) was pwnd by (player name)

Cracked items changed to Fucked items (example, cracked bow = fucked bow)

1337.