Shit is a word generally considered to be vulgar and profane in Modern English. As a noun, it refers to fecal matter, and as a verb it means to defecate; in the plural, it means diarrhoea. Shite is a common variant in British and Irish English. As a slang term, it has many meanings, including: nonsense, foolishness, something of little value or quality, trivial and usually boastful or inaccurate talk or a contemptible person. It could also be used to refer to any other noun in general or as an expression of annoyance, surprise or anger.
