A crusty dog is when you fuck a girl who just got done with her period and bloody flakes of goo get stuck on your penis.
Crustydog: a penis covered in dry period blood
Man I fucked Amber last night and that bitch gave me a crusty dog.
Man I fucked Amber last night and that bitch gave me a crusty dog.
by AssLicker449 June 18, 2019
Get the crustydogmug.