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"
Technically, this scenario doesn't even qualify as NTR. The term you're looking for is BSS.
by LowerMyGoddamnTaxes April 9, 2021
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God! Perry is such a liar! He totally has BSS!
by James Fredricks March 11, 2010
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Bowl-Splattering Shit; i.e.: it is a miracle the commode didn't explode.
1. That was the biggest BSS ever. Stay out.

2. The biggest BSS mawfaws are those televangelists.
by djn1010et January 12, 2013
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“Dude fight me
Shut you ass up and go eat a BSS”
by YaBoiSonOfARis February 7, 2019
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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.
Random person talking for 10 minutes about something REAAALLY important

Brian (after 10 minutes, pauses for 5 more): What?

Brian just pulled a BSS
by omss January 27, 2009
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Blood Snot Shits

When you take a shit and it comes out bloody and burns. Typically includes many small floaties. Often occurs after a big night of drinking.
Holy Shit Pete, I had three BSS this morning. My asshole is on fire!!!
by ZuntleCapacitorWavelength September 22, 2013
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Abbreviation for Barry Spelling Syndrome. A syndrome preventing you from properly spelling basic words just like the wise founder of BSS, Barry. Some BSS side effects can be Racism, Asexualism and emotional reactions to eggs.
Someone: “Hey can you help me spell Device?”
Barry with BSS: “D-E-V-I-S-E”
by Yerbamet August 9, 2022
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