The term BS can refer to two different things. The first is a Bachelor of Science degree, which is an undergraduate degree that typically requires four years of study in a scientific field. The second is a slang term for nonsense or lies. In the context of a crossword puzzle, the solutions FIB (3 letters) and MYEYE (5 letters) could refer to either of these meanings. FIB could be short for fibbing, which is another word for lying, while MYEYE could be a play on the phrase 'my eye, ' which is used to express disbelief or skepticism.