Grab your silver bullets!

A Michigan woman who claimed to be a real-life “werewolf” bit off another gal’s ear in a ghoulish attack, according to a report Thursday.

Allison Thompson Weaver, 44, allegedly told cops she was having sex with the 48-year-old gal — who was role-playing as a vampire — when she chomped down on her appendage on Sept. 17, according to torontosun.com.

When cops arrived at the apartment in Rochester Hills, they found both women partially naked and soaked in blood, the outlet reported. The victim was also covered in scratch marks, bruises and puncture wounds.

“Ms. Weaver told me that they were having consensual sex and that [the victim] was a vampire and that Ms. Weaver was the wolf,” Deputy Shawn Hopkins testified in court this week, according to the local station WTAE.

But the victim claimed she had actually been sleeping before the attack.

“I remember her strangling me,” she said, according to the station. “The next thing I remember is trying to get away and hearing her, as clear as day, with no reflection in her tone, just saying, ‘Sorry (name), but you’re gonna have to die today.’”

Weaver pulled the Mike Tyson-meets-“Bad Moon”-style move while high and drunk, police said.

“This is one of those cases that will be once in a lifetime for deputies,” said officer Jason Dalbec, who worked the case.