Still WTF, but at least the label matches the picture...
Edit: the lower left probably says something about black pepper and salt (ブラックペッパー&ソルト) -- I can't tell what the rest of the characters are though through the JPG compression. Probably (\ included) for the parenthesis bit?
It's the collaboration edition with the cartoon character タイツくん (Mr. Tights), and there are many more goods like this on their website.
Specifically on this package. At the top there are タイツくん (Mr. Tights) and 大人のドリトス (Doritos for adults, which I should note doesn't mean it's adult-restricted, they just put that to many food and drink to mean those can be enjoyed by adults).
In the main image, we have 電気アンマ復活, revival by an electronic massager, which is a mischief game played by one person holding the other person's legs, stepping on their genitals, and turning around the feet, mimicking an electronic massager, as is shown by the characters.
In the bottom left, it says ブラックペッパーとソルト味, black pepper and salt flavor. In the bracket, 竹炭入り, added bamboo charcoal, which is also quite common in Japanese snacks, because people think it's healthy.
Visited Japan recently and was surprised at the lack of fucked up chip flavors. Sure, they were somewhat different, but still clearly chip-appropriate food flavors. My friend there tells me stuff like this tends to be sold at very limited times and also varies by region. So weird flavors are more like rare special editions than the norm.