Crusty Cum-Rag

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 Crusty Cum-Rag!