The moment when you've been without sexual contact for such a period of time that even simple, normally unsexual acts can result in an unwanted ejaculation.
Steve: Bad night man, i've been shelved for 2 months and jizzed my pants while watching dancing with the stars..
by BP12 July 17, 2012
To insert an object into the anus!
I shelved a cucumber into my butt and loved it
by funpac January 29, 2010