A male or female who appears to one as attractive, until they get to know the person and become disappointed to find out they have absolutely no personality.
Girl 1: How are things with Will?
Girl 2: Ah, I'm so disappointed. He seemed perfect, but every date with him feels like forever because he's so dull.
Girl 1: Haha, he sounds like a total doorknob. You'd better ditch him.

Guy 1: Dude, look at that girl over there. Pretty hot, right?
Guy 2: Oh, Stacy? We used to date, but then I realized she was a total doorknob. Nothing to her. She can barely hold a two minute conversation.
by awyeah18 June 22, 2011

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Someone who is a doorknob is someone where everybody gets a turn. Do you see?
"That Natalie Peake is a right doorknob!"
by Halo August 30, 2003

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Someone who has frequent sex, with anyone who will stoop low enough to fuck them, regardless of physical appearance and/or hygiene.
"So I heard you're dating that new waitress..."
"Yeah, why?"
"Dude, she's a doorknob -- everyone gets a turn. I tagged her twice last month. I saw your dad coming out of her apartment yesterday."
by Dharma Midget July 02, 2016

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A mechanical device that secures hinged doors, thereby keeping your family safe from danger.
I sure am glad that my door has a doorknob so bad guys can't get in my house.
by Talek Malatabqcar (LP) December 17, 2005

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a stupid idiot. a way of making fun of som1 without using such harsh words like slut, bitch, whore, ass-hole, ass-wipe ect.
it sounds stupid, but once you start saying it, its actually quite addictive and fun!
someone,"you suck!"
you,"shut up, doorknob!"
by pop-n-fresh March 30, 2006

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Deadpool's name for his guns.

A recurring gag of Deadpool's is when he calls his guns "doorknobs", only to confuse both allies and enemies.
"Doorknobs don't kill people; I kill people." ~ Deadpool
by Merc of a Mouth January 07, 2013

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A farting game. When someone farts who is playing the game, he/she must say "safety" before another participant says "doorknobs." If "doorknobs" is spoke before "safety," the farter can be punched in the shoulder unless said farter touches a doorknob. When played by veterans, the pre-fart safety, "pre-safety," can be employed for no more than two minutes to allow for those times of uncertain gastric distress.
Me: <fart>
Other: "Doorknobs!"
Me: Moves toward closest doorknob too slowly.
Other: <smacks me in the shoulder hard>
Both: Laugh.
by Project Specifications August 05, 2012

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