Just because it is here as a meme doesn't make it a symptom. People's crusade against self-diagnosis is really getting ridiculous.
I'm autistic and I do this. My SO who is not (but most likely ADHD - sadly, diagnosis is impossible) does it too. It's just a fun thing that lots of people seem to relate to. Let's have some fun here, alright?
I think Chinese and Korean culture share this concept, and I wouldn't be surprised if there were more Asian languages who did. Since a daughter joins her husband's family upon marriage, their children are considered belonging to the other family. I recently learner that apparently there's a saying in Korean that daughters always leave things at their mother's house when they get married so they have a reason to come back despite having left the family.