A user of 4chan's /a/ board, who, starting October 2010, started writing a story where he was inspired to brush his little sister's teeth after watching Nisemonogatari's infamous toothbrush scene. Eventually, it got to the point that they married and had a child together. He kept posting for about 3 years, until August 2013, when he was never heard from again. Nobody knows if the story is real, but nobody can prove that it's false either.
Aidan: "yo have you heard of that one Oral Hygiene Bro who fucked his sister"
Bob: "Yeah that's some messed up shit"
2. The conditions or practices conducive to maintaining social health, positive social relationships, and interpersonal well-being, as well as preventing isolation, loneliness, and relationship weakening or loss, especially through community formation and engagement
I'm going to spend my weekend emailing, texting, calling friends I haven't talked to in a while – keeping-up my connection hygiene.
(1) One step beyond casual friday - Going to work unwashed in dirty clothes
(2) A work place dominated by unclean, unwashed co-workers
(3) A remote work location such as Alaska
Jimmy: "Have you been out to the field office?"
Jack: " Yeah it's totally hygiene optional with that crew - especially the chick"
Jimmy: "What are you talking about - she has most of her teeth"
Jack: "Yeah - in a JAR!"