A place for a man to rest his penis after sex.
Friend 1: Aw man I just had the best threesome of my life, mind if I use this as a dick shelf?
Friend 2: Dude, that's my keyboard!

or

Friend 2: Dude, that's my girlfriend's head!
Friend 1: Yea, she makes a good dick shelf.
by FishHookers February 20, 2008
A term, originating from the Hawaiian island of Kauai, used to describe an individual who is completely useless. Commonly used in reference to a person who wants to appear busy and is doing something of value, when in fact they are doing absolutely nothing but wasting time and oxygen.
I hate working with that guy, he never does shit, he's a total dickshelf.
by Small-balls Mike September 05, 2011

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