Strategy in Tekken 8 pioneered by TheMainManSWE. Refers to ending a combo with Right Splits Kick (f+4) on Kazuya and using a Devil's Steel Petal (f,f+4) on the grounded opponent. The Steel Petal is not guaranteed, but is beaten by only one wake up option (quick rise). In any other case, the hit either connects with the grounded opponent, resulting in total damage higher than guaranteed combo enders, or counter hit launches them into another combo if they try to get up and interrupt. In the case of grounded hit, it will also flip the opponent on the ground and set up for Mishima Wavedash 50/50 Mix-Up "Okizeme".
This term can be used to refer to tech pioneered by TheMainManSWE in general, as there have been previous masku techs in previous Tekken games, but above is the most relevant usage of the term today.
TheMainManSWE: "Okay chat, this guy doesn't know the masku tech, this round should be over"
*lands masku tech*
Chat: "MASKU"
Chat: "EZ"
Chat: "LMAO"
Chat: "GG"