1. Adjective. When an individual exhibits or develops behaviors in the autism spectrum, at an advanced age. Typically occurring from misdiagnoses or underreported cases. Affects ages 19-50, NEETs, and many a weeaboo.

Symptoms: increase in frequency of dropping Spaghetti and general lack of self awareness at an age where one is supposed to be accustomed to social norms and rules of social engagement.
"Yeah, that guy has Adult Onset Autism or something. He won't shut up about video games at the bar when all these cute girls walk by."
by DuedBraj December 25, 2014
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Rapid Onset Pussy, n . {acronym, R.O.P.}

(1) Consensual, rapidly initiated unexpected sex with an unexpected woman at an unexpected time. Can be initiated by either party and must immediately follow introduction.

(2) The phenomena of sudden female attraction that is articulated through the physical act of consensual love, coitus, within the first 48 hours of a relationship.

(3) An unexpected, unpaid sexual encounter with a new, strange, partner.

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DAVE: "So you didn't even know that girl? Never met?"

PRIMO: Ummm, YEAH. But I know her now!!!

DAVE: "DUDE! ROP ON!"

"Rebecca, just loosen up and go out and go for a ROP with the hottest guy you can find!"

"Rapid Onset Pussy has restored my faith in humanity and renewed my trust in God. Praise Jesus for ROP, for without Jesus I could not love her sweet tight ass!"

"That ROP from last night was one helluva a screamer."

"Rapid Onset Pussy loves it in the ass because all women love it in the ass. Just warm her up with a shocker then blow her fucking mind."
by Primo Primo Primo October 30, 2006
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a form of epilepsy that isn't all that bad but it makes you have short, kind of uncomfortable seizures that I really would prefer to not have.

It is also slange for what Emu's do on their days off. Little known fact right there.
Ex 1: Due to my Partial Onset Epilepsy, I have seizures sometimes and they make me feel quite ill (NOT the good kind of ill). On the plus side, I get to take anti-convulsent medication with many, many side effects. It is so great.

Ex. 2: I heard that when an Emu gets a day off it is refered to as Partial Onset Epilepsy. They could have picked a better nick-name. It is so not funny to make fun of neurological disorders. Emus are all terrible.
by 2 Cool 4 School and U Know it! February 4, 2010
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AKA EOH. When you are so damn cold it hurts.
Sweet Mother of God I wish I would have used a jacket. I think I have Early Onset Hypothermia.
by ACSprain771995 November 27, 2017
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liars, lying, thief, thiefs, morons, a group of people that don't know how to respect others and are overall the definition of bad
these people are just like Sonic Onset Adventure!
by sanikdud May 28, 2021
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Like delayed onset soreness, the lower back and other pain in the days after moving copious amounts of snow off of sidewalks, cars, etc.
After hours of shoveling yesterday, delayed onset snowness is making my lower back squeal like a pig.
by KMango February 8, 2010
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a gradual transition into the realms of trisomy 21 usually occuring after adolesence
symptoms include:
a gradual lowering of the i.q.
tounge lolling
compulsive masturbation
"Lily is getting dumber by the second, maybe she has adult onset downs (A.O.D.)"
by Andrew LeDOWNS September 1, 2008
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