The diligent process in which you need to remove the hideous from your mind: usually involving some mind trick, pleasant distraction, copious drinking, or combination of all of the above.
OMG, When the "beer goggles" came off the morning after, I totally needed a hidectomy- so I went back to the bar for a little 10am happy hour action.
After walking in on my dad and the babysitter doing it doggy style dp with my childhood doll I'm totally going to need a hidectomy.
Sue cried out "Mental picture go away!" repeatedly as an attempt to induce a hidectomy after she caught a glimpse of her grandmother's vajayjay