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1.
A pencil you do not sharpen. You simply click twist or push down to replace your dull or broken graphite. Most college kids use these to avoid getting up over and over.
old man"i've been sharping this pencil for 10 minutes and its still not getting sharp"
Community College Student: "here bra just click it and sit your old ass down.
old man "whats this?"
Student: "a mechanical pencil, they cost thousands of dollars and are from Uranus now you owe me"
Old man "Can I pay you in 5 easy payments"
Student "uuuugh I guess"

by Rebecka.wicker. January 16, 2009
 
2.
The act of hitting a man in the behind numerous times, while attempting to get him to ejaculate.
"Yeah, Jim has some sort of erectile dis-function. His wife has to give him the Mechanical Pencil to make him cum.
by Andrew676Runner December 07, 2012
 
3.
wrap your dick in tin foil and go into intercourse with a woman while moaning "i need to finish the essay!" after ejaculation you say "i ran out of led, i need a refill"
pencil nut, mechanical pencil
by king awesomeness January 20, 2011