milkspider Share definition Flag When you blow your load all over someone's asshole. The cum fills the hole and the cracks around it making it look like a spider. Charlie gave Danna a milkspider at the party last night. milkspider by Reddog101 September 19, 2016 0 0 Get merch Get the milkspider mug. Buy Now — $32.95 See more merch