Coined on episode 33 of the Bloody Gun Club podcast, to nerdcheck is to correct someone with (overly) technical details, especially when it has no real effect on the conversation or situation. The correction usually starts with, "actually" or "technically." It usually makes you want to yell, "WHATEVER!" in their face.
"Person1: The song is 3 minutes long."
"Person2: Technically, 3 minutes and 2 seconds."
"Person1: Don't ever nerdcheck me again."
Someone who cleans a dead woman's vagina with his tongue. Usually a prelude to sex with the corpse, making a necrodoucher oftentimes a full-blown necrophiliac.
An insult associating a disliked person with such an unspeakable act.
That asshole Bob is such a psycho, I bet he gets his jollies from being a necrodoucher.