A girls pubic hair (or lack of) from the age 10-14
A classification rather then a word your going to throw around willy nilly... Possibly used by young boys in the playground joking about.

"Did you see Hannah's baby rat George? What was it like?"
by TheFlyingBadger May 29, 2012
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BABY RAT: young sluts... the kind or girl that has probablly slept with you and four of your best homies... Usually lazy as hell and stupid..they are known to party a lot.. easy to take advantage of, hard to get rid of.
Im so tired of these fucking baby rats.
by mr.yayo October 10, 2007
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When a girl looks good one day but doesn't look good other days she is a rat baby...
Damn dude she looks good today... But yea she is a rat-baby, just wait and see what she looks like tomorrow..
by bown baby daddy's baby daddy September 4, 2009
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you know those kids in your class.

they have the worm on the strings and bring rat stuffed animals to class.

everyone makes fun of them. and i understand why, they are fucking weird
ok so like have you every been to a cosplay con, and you see those bnha cosplayer T-posing in a circle and singing, “it’s your power todoroki”? that’s what a uwu rat baby is, an obnoxious loud weird kid who has no respect to others
Quirky kid: uwu i’m such an uwu rat baby
ew
by Beetastic🐝 April 21, 2020
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A rat baby is a rat-like child brought into this world by a rat-like human ( someone who pisses people off).
Steven wood brought a rat baby into this world because of his rat-like personality
by Don’t talk to me November 17, 2019
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