It was from a cooking video on YouTube. Host was saying there was another name for the dish but he didn't want to get demonetized. Naturally I went, "it's bukakke isn't it?". Then came the googling and wikipedia.Now the question is: from which direction did you come upon (no pun intended) this information? Like, were you Googling stuff about noodles and "surprise," or... y'know.
Fun fact, wikipedia seems to have a very devoted artist who makes renditions of numerous sex acts. At least, it looks like it's just one person. Must have a lot of time on their hands.