add-on 

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.

add-on by ADB October 12, 2003

Add-on 

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

Add-on by IsaacHunt December 24, 2015

add-on 

A strap-on for a female computer. Mispronunciation of hardon.

I got an add-on in PC world.

add-on by Delusional October 8, 2003

Add on 

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 by climbtimeBITCH July 3, 2011

Add on 

Adding on to the fuckery and nonsense that already exists.

Damn….you just ripped me off again. Add on.

I let you back into my life. Add on.

Add on by MP, ES January 6, 2024

add-on dick 

A penis that is so long, so big, and so "womanly desired" that it's probably fake somehow.

"Hey, I heard John gets lots of women in bed nowadays."
"Yeah, ever since his surgery, girls have been falling in love with his add-on dick."

add-on dick by Edudnax April 21, 2018

add-on child

A child born to keep another child from being an only child or to provide transplantable parts for an older child, especially one who would not have been conceived otherwise.

In Jodi Picoult's novel My Sister's Keeper, Anna Fitzgerald, the daughter conceived to provide bone marrow and a kidney transplant to her terminally-ill older sister Kate, is the add-on child of the family.

add-on child by JavaJaneOhio December 9, 2010