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1.
Figurative accumulation on a guy's dick when he hasn't had sex for awhile. Might also co-occur with the accumulation of dust.
After months of single life, Dave has accumulated a load of cockwebs.

Hey baby, you wanna be a dear, clear out my cockwebs for me?
by dave99 December 13, 2004
 
2.
An out of commission cock
"I haven't got laid in so long, I've grown cock webs".
by Carolick April 27, 2011
 
3.
The orchestration of multiple cocks and or male genitalia to form the shape of a web.
Mike, Hank, Larry and Colti are engaged in a cock web.
by mike chewbrush June 30, 2008