Noobflake

Noobflake, noun.
Not necessarily a noob, but someone you are gaming with that you do not like for whatever reason. This might be: Their style of gaming, killing, driving, speaking, thinking, shooting, throwing grenades, etc.

These are experienced by everybody sooner or later, and everyone seems to hate them.

Note: Usually either a very high level, or a high level disguised as a low level.

Also included: People who get lucky as hell kills.