Pdd-nos means 'pervasive developmental disorder (pdd) not otherwise specefied' and is an diagnose for people who are in the autistic spectrum, but who don't have the right symtomps to have an other label, like Asperger's. It is often milder than other types of autism, but can be pretty hard to live with too.
"I just got back from the psychiatrist. He said my son has pdd-nos, which is an type of autism."
by EmmaBatstJou August 29, 2007
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Dumbass who put NOS energy drink in his bike thinking it would improve its performance. Guy originally posted on a GSXR forum (user sti2gsxr), and may or may not have posted as a joke. Nonetheless, its funny as hell because, someone, somewhere has done it.
sti2gsxr is forever know as "nos guy" after he put NOS energy drink in his bike.
by 6doublefive321 May 23, 2009
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When you push your thumb in her ass during doggy style!
I guarantee you will make her cum in half the time if you push the nos button!
by The Golden Greek May 28, 2016
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Saying "oh no" in a more meaningful or comical way.
My friend nailed this chick but then her father came in he was like, "oh nos..."
by Boady May 23, 2007
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An expression often used before something horrible or painfull is about to happen.
Plural of Oh no! stupified and ended up being O nos!
"He's coming from behind and he forgot to lube!"
"O nos!"
by Poboom December 13, 2003
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