The term "bosh" is often employed in both casual and formal speech to downplay or reject an idea or argument. While it was once primarily used to describe speech or theories, it has also been extended to describe any claim or assertion that is considered false or without merit. Its use is common in satire, comedy, and critical discussions, where it serves to convey disdain for the perceived worthlessness of an idea or statement.
Despite its somewhat playful tone, the term is often effective in making a sharp critique, and its historical ties to Turkish and French provide a rich cultural context for its modern usage in English.