When someone (usually a dudebro-chad-jagoff type, but not limited to males) is exhibiting especially bad behavior, this could be used as an insult/descriptive noun.
Becky: Brad just did the weirdest flex on me in the boathouse, telling me all about his trust fund.
Mellisa: Whatevs, just ignore that CrustyCum-Rag!
When a womans ass gets completely filled with semen from a large group of men, then chugs a bottleog magnesium citrate causing her to expell all the semen like a volcanic explosion.
Dude! We turned a chick into a volcanic cum dump last night! A bunch of guys busted a nut in a chicks ass, then she chugged a bottle of that liquid stuff you drink before a colonoscopy, she violently shit out all that cum all over the place!