A disease every kid these days claims they have.
I have ADD. Me too. Me 3. Me 4. Fuck you.
by ass crust June 18, 2003
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Often associated with a program. Add-on refers to an additional feature not included in the inital release, available later usually as a download.
The new Internet Explorer add-on allows you to permanently highlight text in yellow so you can see important information.
by ADB October 13, 2003
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makes homework impossible due to high distractions and racing thoughts .. it took me 30 minutes to write this definition due to thinking about sex , dragons , and hot female singers
teacher : have you done your homework ?

me : sorry ADD took it's toll last night
by bonjour12377 January 14, 2013
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Attention Deficit Disorder is a REAL disorder that every douche bag and their mom likes to PRETEND they have. Either to score meds or to gain the sympathy of others, while the other half of the world likes to pretend it's all a big joke.

Well ADD is in fact a REAL medical disorder and makes doing simple, every-day things difficult to focus on. People who really DO have ADD are not joking when they say they find it difficult to focus on homework, classwork, etc etc. It's not funny and the medication for it really DOES help and they aren't trying to score narcotics
"It really sucks not being able to focus on the hobbies/things I like to do, I'd like to be able to pass Math but it's really hard for me to understand because everything I try to learn in class seems to just slip past me. Thank god for whoever the hell invented this medication that helps me slow down my train of thought and focus so I can do better! Too bad everyones going to think I'm faking it when I say I have ADD"
by Mighty Twig October 15, 2009
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To sum two or more numbers
When you add 4 and 5 you get 9
by Anonymous September 20, 2003
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Contrary to popular belief, it is not just a lame excuse for misbehaving children. While it is sometimes labeled as so by people who don't know what they are talking about, it is an actual disorder that has more effects besides misbehavior, including difficulty concentrating and restlessness, and should not be discounted amongst cynics with nothing better to do than whine on the internet.
I am a 16-year-old with ADHD that really does have difficulty concentrating who takes medication that does actually help, and is not called ritilin.
by Striddle February 17, 2005
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A climbing game similar to HORSE in basketball. Two or more climbers will alternately climb up a wall/shelf/boulder one or two holds at a time in attempt to make their move too difficult for their opponent to complete. Each time a mistake is made or a player falls a letter is added. Whoever does not have ADD ON spelled by the time everyone else does is the winner.

This game is common among bouldering cllimbers.
Climber1: "Hey dude wanna play add on?"

Climber2: "Yeah. I hope you can set on a backstep to a pinch hold, bitch!"
by climbtimeBITCH July 2, 2011
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