When you personally have made a repair to a machine and feel that it works better just because you worked on it. Even if the part of the machine you worked on would not make it work any better.
Jim: "I replaced the heater core in my car, now it seems faster..."
Sam: "I've heard of that before."
Jim: "Seems to run smoother too!?"
Sam: "That's Mental Horsepower!"
Sam: "I've heard of that before."
Jim: "Seems to run smoother too!?"
Sam: "That's Mental Horsepower!"
by MNIGHT August 21, 2009

by get it right the first time May 31, 2009

Holy shit I was behind Susan in yoga today. I totally put that in my mental viewfinder for tonight’s wank.
by timbre December 5, 2013

League of Legends causes mental rape. The symptoms are hair loss, depression, and anti-social disorder.
by Amongussussyballsfortnite September 4, 2021

by Ninja Yoshi October 20, 2019

John: Do Celebrity's Have Surnames ?
Like Madonna
Maria: What Do You Think Asshole, Are You Mentally Disorganised Or Something. KMT
Like Madonna
Maria: What Do You Think Asshole, Are You Mentally Disorganised Or Something. KMT
by nadiiYA. April 5, 2009

by r+t March 21, 2021
