The use of "period" (or sometimes "periodt") after the end of a sentence to stress its importance or finality is a colloquial expression that has become popular, particularly in online communication, social media, and informal conversations. It is often used to emphasize that the statement made is definitive, non-negotiable, or the speaker's unwavering stance on a particular matter.
The term "period" is borrowed from the punctuation mark "period" (full stop) that is used to mark the end of a sentence. By appending "period" to the end of a statement, the speaker is metaphorically suggesting that there is nothing more to be said on the subject; it is the end of discussion or argument.
The use of "period" in this way adds a sense of assertion, conviction, and finality to the statement. It is similar to saying "end of story" or "that's final" to make it clear that the speaker stands firmly by their words and does not wish to entertain any further debate or dissenting opinions.
This linguistic phenomenon is part of internet culture and the evolution of language in online spaces, where brevity and emphasis are valued. It is also a way for individuals to assert their opinions or perspectives strongly in a succinct manner. However, it's worth noting that this style of communication is informal and might not be appropriate in more formal or professional settings.