(1) A generic sexual bodypart.
(2) A generic carpart.
(3) A term used to trick people that don't know much about sex or cars.
(1) Dude, I think I sprained my kanuter valve when I lost it on the handrail.
(2) Sorry ma'am, we're gonna have to replace the whole kanuter valve, and the one that fits your car is mighty expensive.
(3) Hey Chris, know what a kanuter valve is?
To forcibly remove an individual or group of individuals from a group or community for no other reason than that you don't think they should have an opinion or that you're just a prick. One of the two.
"Hey, did you hear Duncan kabuteroed Charles out of the club the other day?"