Top Definition
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.
додав ADB 12 Жовтня 2003
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!"
#add-on #bouldering #jugs #pinches #set #slopers
додав climbtimeBITCH 02 Липня 2011
A form of vermin native to civilisation that survives by crowding around groups of people and taking up space.
Will: Who are these people?
Maria: Add-ons
Will: Oh
додав IsaacHunt 24 Грудня 2015
A strap-on for a female computer. Mispronunciation of hardon.
I got an add-on in PC world.
додав Delusional 08 Жовтня 2003
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