Yes, ‘blank-Fu’ has been used since the 70s, but as a long time fan of both Trek and HK action films, I can’t say that what Shatner was doing in TOS was referred to in that way until recently.

Is it really so controversial to say 1) Kirk Fu became current in the fandom since the book was published; & 2) the meme is a clear lift from a published work and the drawings its artist Christian Cornia, they deserve credit?