Short for Batshit Insane i.e. beyond crazy

see: Batshit Insane or Bat Shit Insane
Person #1 "I just saw some chick take her clothes off and run down the street naked"

Person #2 "She must be BSI"
by BSI Observer June 4, 2009
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Short for Bunny Smiles Inc, a fictional corporation that is the main focus of a fnaf inspired web sieries Walten File
BSI is planning to open a new attraction sometime this summer.

Here at BSI we bring our sincerest apologies.
by ExhibitHumanBehavior May 26, 2021
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Black Screen Idiot- somebody who goes onto a video-chat site and doesnt turn there camera on or they block it from seeing them...... why go on to a video chat site if you arent going to let people see you!!!!
Friend: Yo what are you doing
You: im on chatroulette..... HOLY SHIT another black screen!!!!! im so sick of these BSI's

Friend- yeah i know, im so sick of them
by # your mom July 21, 2011
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Stands for "bull shit industries". The headquarters for the company is based right on top of gunnersbury underground station, but surprisingly, know really knows. They're most known for their blatant disregard for customers' needs and it's outright stupidity.
"Ah, s car's broken down, I'm calling bsi"
*rings them up*
"Okay, my car's broken down-"
"*in a bad indian accent* helo wood u like a banana?"
"Man. This some more bull shit."
by Punjabi Peanut May 23, 2023
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= bullshit investigation, for those who support the FTP movement and believe that every investigation is total bs, because it ruins the person's privacy
Guy: "FUCK YOU, POLICE!"
*policeman is dead silent*
(after investigation and sanctions)
Guy: "Man... that was a BSI, not a CSI!"
by MindsEyeTHPS April 13, 2017
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