Infantile

To act in a childish or immature manner.

Alex: Today, in class, my friend and I kept laughing then annoyed the teacher. I must do it again soon!
Deeanna: Oh Alex, you're so infantile.
Alex: I know, I can't help it.

by Significant Auxiliary May 9, 2014

Infantilism

Enjoyment from infant-related things. Pretending to be a baby, wearing diapers (see diaper lover, speaking like a child (ie "I sowwy"), sleeping in a crib. Wide range of things, but all infant-related

Note that this is interest in the trappings/behaviour of youth, not sexual interest in the youth themselves (that's a pedophile)

by Anonymous March 21, 2003

infantilize

verb trans.

to treat someone as a child or in a way that denies their maturity

jimmy infantilizes his friends all the time

by jeny September 3, 2007

Infantile Pillock

A child-like or child-sized penis.

Infantile: relating to infancy
Pillock: a fool or idiot; a penis

Person1: You're a jerk.
Person2: Butthead.
Person1: Infantile Pillock.
Person2: ... did you just call me a small dick? YOU'RE the infantile pillock.
Person1: Haha.
Person2: What's funny is that you aren't disagreeing...

by princess.peach December 30, 2010

Infantilize

Not a word. Some may think it is. But no, tis not a word.

GSM: Don't infantilize me
me: that's NOT a word

by BGC August 27, 2007

Infantile Pillock

A childish and stupid person.

Dude A: "Why are you laughing at that stupid joke someone just told you?"
Dude B " I really can't help it."
Dude A " You really are acting like an infantile pillock."

by Hay, Dan Newman, Dan the Man March 18, 2016

Paraphilic Infantilism

A fetish where people dress up like babies

My son's preschool teacher is into Paraphilic Infantilism and often wears diapers under his pants.

by Chodeyjones42 April 21, 2015