In a
Westminster system, unparliamentary language is words or phrases that are deemed to be inappropriate for use in the House whilst it is in session. This includes, but is not limited to the suggestion of dishonesty and
foul language or
profanity.Exactly what constitutes unparliamentary language is generally left to the discretion of the
Speaker of the House. Part of the speaker's job is to enforce the assembly's debating rules, one of which is that members may not use "unparliamentary" language. That is, their words must not offend the dignity of the assembly. In addition, whilst in the house legislators in Westminster systems are protected from prosecution and civil actions by
parliamentary immunity and consequently are expected to avoid using words or phrases that might be seen as abusing that immunity.
See more at Wikipedia.org...