BSS

BSS stands for ぼくがさきにすきだったのに / Boku ga Saki ni Suki datta no ni loosely translates to "Even though I loved her first" which is a subgenre of NTR where the main guy and girl aren't officially in relationships such as girlfriend or wife, but the story still evokes feelings of jealously and loss when the main girl ends up with someone else"

Bss stands for Bee Swarm Simulator and it is a farming game in Roblox

Bull Shit Syndrome

Bowl-Splattering Shit; i.e.: it is a miracle the commode didn't explode.

Ball sack sandwich

abbreviation for "Bus Station Skank"; an especially derogatory variant of skank.

BSS (also known as the Brian Schwandt State) occurs when the mind of a human transcends to a 3.14th dimension where the only thought is of the thoughtless. It is at this state where a person can feel that they can draw a total blank; be it a white, black, blue, slightly green, or gore red blank. Only people with practice and time spent intensively meditating can achieve the BSS. Records of people "pulling a BSS" were found dead in various places. On the roof of a really tall building, the side of the Golden Gate Bridge, or even during skiing. Unfortunately, those people were found dead, shortly after "pulling a BSS".

Common symptoms include, but not limited to: Concussions

In other words, BSS surrounds us all, we all just have to find our inner Brians.