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Stands for Nerd Attention Deficiency Disorder. It is a mental disorder. It is characterized by an inability to pay attention to things that are real, important or boring, frequent trips into fantasy worlds, a love for anything obscure or geeky and a general lack of focus on things that have application in reality. Coined by the blog "Rands in Response".
"I was supposed to do my homework, but then I watched Firefly, my NADD is acting up."
NADD by cognitoin August 19, 2009
Related Words

nadd juicer 

a device that crushes your nadds.
nadd juicer by Earl Talladeges January 16, 2009
When you're having sex with a partner and you throw skittles all over their face at climax.
Did you naddition her last night?
Naddition by TheRadicalMomo August 21, 2019
The sexiest artist in this dimension, a man of men. A chivalrous sex icon who capitalized on linguistics in such an arousing way, all those around him succumb to his ways.
Yo man, we can’t play Naddí at the wedding because my parents are gonna be there, and I don’t want them to see my girl act up.
name givin to a variety of perscription stimulants (i.e. RITALIN, ADEROL, DEXOSOMETHING?)
"hey dudes, let's get some naddle"

"after sniffing it, i became naddled"
naddle by Anonymous June 11, 2006
Natural Ice...
a really nasty cheap beer
that gets you drunk really fast.

usually the only stuff the hobos
can afford and come in large cans
yo man lets party...

dude all i got is naddy ice..

thats all right bro i got some
captin in the trunk

yes!
naddy ice by nonametosay April 13, 2008