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1.
Appellation to describe black-wearing art-school-of doom girls. Phrase originated in the early 1990's by comic artist Bill Willingham, who used it to describe the female publishers/artists of a rival comic company (CHAOS Magazine).
Spiderfarmer in common parlance:

Comic Geek: Dude, I'm so going to hit on that spiderfarmer.
Comic Geek2: Don't bother man, she's out of your league. She'll just feed you to her tarantulas.
by Al Kami May 13, 2006
 
2.
1. A complete, total and somewhat creepy freak. They impart the mental image of someone lying down in their basement pre chewing bugs to feed one of the hundreds of spiders they keep as pets.

2. One who reminds you of a safe, benign version of Jame 'Buffalo Bill' Gumb from Silence of the Lambs, The (1991) - particularly in his collection of moths

3. A loser who rarely sees the light of day working on Rube Goldberg contraptions.
He’s a loser in a really odd way - there is just something really weird about that guy, he really is a spider farmer.
by finnadat May 24, 2004
 
3.
A person who wears unattractive clothes and is sort of asocial. They may be seen wandering the co-op grocery and tasting everything in the store. Spider farmers buy very small amounts.
Look at the creepy spider farmer over there next the cheese counter.
by B.Myers July 21, 2005