crassmantic Share definition Flag An unrefined, insensitive, or course expression of an amorous ideal. “My boyfriend is so crassmantic, he told me that when I'm slurping on his Schlong, that I complete him.” crassmantic by The Ominous Harbinger January 26, 2009 0 0 Get merch Get the crassmantic mug. Buy Now — $32.95 See more merch