(The links in this article are slightly racy, so be warned.)
In the comments for the entry titled Exciting New Doritos Flavour!, a commenter going by the name of “manfire” explains that these characters (in the right column of Japanese writing on the Doritos bag pictured to the right):
read as denki anma.
As “manfire” says and a little Googling confirms, “denki anma” translates roughly as “a crotch noogie done with the foot” and it seems to be popular in the strange world of porn from the Land of the Rising Tentacle.
Doing a search for the term “denki anma” is an act for the brave, as it will lead you to many disturbing sites with even more disturbing imagery. Here’s one of the tamer images I found; I find it oddly reminiscent of the customer service at the Bell Mobility store at the Eaton Centre:
I still have no idea what those Doritos taste like.