Luxxing
To play a game online for years and never get better. Despite this, continue to act as though you have skill, and trash-talk more than the evergrowing number of players who are, and always will be better than you.

Stagnating skill-wise.
To do a Luxx - Talk shit without having anything to back it up.

"He's Luxxing so hard today" - Getting owned repeatedly, but forgetting this fact and continuing to advertise your evermore dubious skills.