The act of allowing a large spider to run up and down the shaft causing stimulation until climex is reached; thus rocketing the spider into the cosmos.
I gave that daddy long legs a wicked cosmic spider last night.
by Arachnophiliacs May 24, 2011
1 more definition
The act of a woman squirting glitter as she cums onto Uranus
Anne made a cosmic spider on Brian that he won't soon forget.
by Golden girls 2013 December 28, 2013