A phrase to describe someone with a single awkward mannerism in an otherwise perfect social demeanor.
Steve: You know, Bill is a really nice dude. I can't find one single flaw in the guy's attitude.
Martin: Yeah, but when he held the door for me this morning, he gave me that weird grin of his.
Steve: Oh yeah, he's totally serial killer material.
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A creepy weirdo with the potential to become the next Ted Bundy.
Joey DiMarco just moved in next door to us.
Watch your pets around that kid, dude, he's serial material.