noun. A precise mind-molesting instrument. I beg your pardon! A mind-molestation-detecting instrument. Oh my.
Real citation: “Shallow Grave and A Simple Plan are fairly high on the mindfuckometer too. Good to see, anyways :)”
(May 13, 2003, http://www.tribalwar.com/forums/archive/t-213229-p-3.html)
Made-up citation: “Want to know if you’ve been neurodoublefucked or merely brainboozled? Order a mindfuckometer today and receive a free whisk."