serial killer material 

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.

serial killer material by TBrownz October 9, 2008