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.
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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
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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
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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
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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
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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."
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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
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