attachment disorder 

When a person forgets to attach a document to an e-mail after explicitly stating that it is present.

Erin: RE: Look at this picture!!
Message: You did not attach that picture on your last e-mail.
Jeremy: Re: RE: Look at this picture!!!
Message: I always forget to attach the picture before I hit send. I must have an attachment disorder.

attachment disorder by Jeremy in Denver January 30, 2008

reactive attachment disorder 

What can happen when you basically neglect you child's social/emotional needs. They develop this mental illness and become extremely insecure, immature and problematic, and get a really low self-esteem. If not treated, they can self-harm and become manchildren with an inferiority complex and constantly tantrum like a severely autistic child, and the disorder becomes very hard or just impossible to cure.

I regret neglecting my daughter. She developed this "reactive attachment disorder" and she had to be put in foster care because she went crazy.

reactive attachment disorder by PorcupineCanadian December 30, 2016

Character Attachment Disorder (CDD) 

When playing a roleplaying game, this unfortunate malady occurs when a player becomes so attached to their character, that they break the verisimilitude of the game by creating copies of their favored character.
This affliction can present itself in many ways, such as giving other characters the same name with slight variations or creating characters that have the same personality or mannerisms.

Wow, Keev cannot make an original character after Carmine. First, it was Barmine and now Karmine? He must have a pretty severe case of Character Attachment Disorder (CDD).

Character Attachment Disorder (CDD) by HerrPetro March 22, 2019

Attachment Deficit Disorder

Someone who is constantly leaving out attachments when sending e-mails, has Attachment Deficit Disorder (A.D.D.). (Similar to Attention Deficit Disorder, but with attachment's).

Mike: email RE: You gotta see this wicked vid!!!

Jeff: opens blank email Huh? There's nothing here! That dudes got Attachment Deficit Disorder

Attachment Deficit Disorder by kishmich October 8, 2008