A man who has matured in years, but not in an emotional sense. If his inflated, fragile ego is crossed, he looks like he might have a crying fit, or might lapse into silent-treatment mode, or have an embarrassing tantrum in one way or another, not unlike that of an infant or a small child.

Usually the cause of his 'distress' is his significant other when she (or he) is not dedicating 100 percent of her (or his) time and attention to to the Diaper Baby. Sometimes 99.9 percent of time, attention, and flattery is not enough for a Diaper Baby. His infantile disposition can also be triggered by unpleasant yet petty and otherwise insignificant interactions with others, such as with co-workers; when receiving unsatisfactory customer service; when his dog doesn't gaze at him with a look of unconditional love 24/7, etc....
Husband: We should go out for dinner tonight. You deserve a break from all of this stress and I would love to treat you to something nice. Just us two, alone. I miss you honey. I need your love.

Wife: Sorry I've been gone all day, but I need to stay home and call people to let them know my mother just died. I also need to make her funeral arrangements. There's alot for me to deal with right now.

Husband: You never want to do anything with me!!! You don't care about me. You never did! This marriage is a joke!

You're only in it for the money!

Wife: I make more money than you and we went out three times this week before my mother died this morning.

Husband: I don't want to hear it! You don't love me. You never loved me!!!!

Wife: (to herself) Oh god, he's being an F'ing Diaper Baby again.
by oscar t.g. September 6, 2011
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Teenagers who usually wear cut-off camo toughman gloves. They make fun of scene kids even though they are scene-core as HELL.

They enjoy wearing straight-legged Levi jeans w/ skate shoes and shirts of bands that they don't even listen to or can't name any one of their songs. Also wears a camo mosh hat everyday.

Also known for complaining about every little thing and being very sensitive.
He's such a diaper baby that he sucks at life.
by Scrotus June 13, 2006
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This is an expression, largely used in New York City, for baby boomer children of avowed American communists. It became the title of a one-man show in New York by Josh Kornbluth in 2000.
When the guy knew all the words to a Russian political song, I realized he must be a red diaper baby.
by Bill Overton June 26, 2006
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One of the best quotes from “Guts” by Raina Telegemier
by Vanessa…que May 7, 2022
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The absolute WORST word you can call somebody. This word is worse that Poopy Head! If a federal agent catches you saying this, they will shoot you on the spot and nuke the entire world.
Friend: Fuck you, your a peice of shit.
You: Your a stinky diaper baby.
Friend: (Fucking explodes)
Federal Agent: (Fucking shoots you and nukes the whole world)
by Some random middle aged guy November 1, 2023
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Someone who was brought up in a liberal, leftist background
"...I knew Rorty a little; he was a shy and gentle man, a red-diaper baby who grew up to be a bird-watcher and a savorer of Proust and Kant in their original languages."
(from RICHARD RORTY’S PHILOSOPHICAL ARGUMENT FOR NATIONAL PRIDE by Stephen Metcalf)
by Prasub January 11, 2017
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The children of leftist intellectual baby boomers, raised from birth on Marxism and a drug tolerant environment, and now in places of political and intellectual influence.
Red diaper doper baby politicians who want to legalize marijuana and tax the successful to support the unproductive.
by Jeff February 27, 2004
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