Anal Spider
A sex move in which you stick your thumbs into someones anus and use your other fingers to squeeze the ass cheeks, causing the anus to open wide as you then move your thumbs in a circular motion.
Did you see how wide her asshole got after that anal spider?
Spider anal
When you put baby spiders in a tube and shove that tube up someone's asshole and open the tube in someone's ass.
You like spider anal don't you?