OP

Original Poster;

Definition
The first person to post in a topic on a forum.

Examples

 * "I agree with OP"
 * "OP sucks!"

=Also=

Over-powered;

Definition
Much like Imba, overpowered suggests a imbalance between class skill powers, and that the person who is OP is benfiting from it.

Examples

 * "Im way too OP to play with you!"
 * "He only won because his class is OP."