Here shall be an alphabetically sorted collection of commonly used acronyms (NOT chemical formulas) and slang prevalent on ScienceMadness and in the indiechem community.
AA—"Acetic Acid" or "Acetic anhydride"
TATP—"Triacetone triperoxide." See: acetone peroxide
UTFSE— "Use the f***ing search engine," usually used when the answer can be found quite easily with a simple search.