Douglas Harper's Etymology Dictionary
BS
c.1900, slang abbreviation of bullshit (q.v.).
Wiktionary
bs
n. (plural of b English)
Wikipedia
BS
BS, B.S., Bs or bs may refer to:
Bs (programming language)
bs was a programming language from Apple Inc. that shipped with A/UX. It was described by Apple as "a compiler/interpreter for modest-sized programs". It provides an interactive prompt or accepts a file containing commands.