Adjustable 

Adjustable means having the facility to be changed so as to match or fit, such as an adjustable spanner. It can also mean capable of being regulated, such as adjustable interest rates.

Adjustable office chairs means one size does fit all.

Adjustable by AKACroatalin May 31, 2015

Concerned Adult Brigade 

Often called "CAB" for short, the concerned adult brigade is any group of equally disgruntled people (usually 35 or older) united together for an absurd and often unnecessary cause. These are the people who run neighborhood watches, regularly attend PTA meetings, deem things "inappropriate", complain to authority figures, overreact on issues, chaperone parties, file noise complaints, call parents, actually check movie and game ratings, work at the FCC, and generally meddle in the affairs of the youth.

Members of the concerned adult brigade come in many forms though are recognizable by their running-for-senator hairstyles and "sensible" shoes. Almost always women.

Girl #1: "So I watched sesame street yesterday for no reason. I thought you said Katy Perry was gonna be on it!?"

Girl #2: "Ugh, she was! But the Concerned Adult Brigade saw her outfit and started bitching. So they pulled the episode off the air."

Concerned Adult Brigade by Hikarichan16 March 19, 2011

Accidental Adult 

An individual whose age indicates maturity but whose approach to life suggests otherwise.

Whenever my neighbor waters his shrubs, he wags the garden hose between his legs and waves to traffic. Total accidental adult.

I try not to laugh when children call me “Mr.” They have no idea I’m an accidental adult.

Accidental Adult by Peeper Winkman April 26, 2010

adult theater 

A theater that only plays pornographic movies(Gay or Straight). Seating varies but usually has at least one area(couch,platform, etc) for sex acts to be performed for the entertainment and/or participation by the theater patrons.

I went to the Adult Theater Friday night and there was a Woman there whos Husband was letting anyone have sex with Her. She couldn't get enough.

adult theater by Shades_1970 August 12, 2015

Adjusted Penis Size 

From the SouthPark episode TMI. According to Randy Marsh, you can calculate your Adjusted Penis Size (or TMI) with the following formula:
((L*D)+(W/G))/(A^2)
Length times Diameter plus Weight over Girth divided by Angle of the tip squared

Randy Marsh has a penis that is 4.4 inches in length. Its angle is 32 degrees. It's flaccid girth is 1 inch in diameter. His balls are 7 cm from the base. Randy notes that the drift of his penis is 4 cm to penis right and its dead weight is 4.5 Kg. Therefore, Randy's adjusted penis size is 6.3 inches.

Adjusted Penis Size by Ingrid Cole June 21, 2011

The "Fuck It" Adjustment 

when you just don't give a shit anymore, the fuck it adjustment is right for you. Just say fuck it. Boom, bam, pow, that shit is out of your way now isn't it? Fuck it, fuck that, fuck everything.

Brought to you by Danny Sexbang

"The assignment is due tomorrow? At least I remembered the "fuck it" adjustment! FUCK IT!"
"Finals? Oh, right, the "fuck it" adjustment! FUCK IT!"

The "Fuck It" Adjustment by Who gives a shit? December 11, 2013

Adult friendship 

Friends with benefits, especially for those past 40.

"I have an adult friendship with David Duchovny" - Gillian Anderson

Adult friendship by GennnX April 26, 2016