In the context of
Martial Arts, to practice in a way that more resembles a Role Playing Game than an actual fight, and/or to overdo it with terms from other languages, elaborate costumes, etc.
One may LARP as a Samurai or Ninja (Aikido, Budo Taijutsu/Ninpo),
Buddhist monk (Shaolin Kung Fu),
special forces soldier (systema, various forms of "street self defense), even a member of another culture in your own country (52 hand blocks).