Is it possible that FS can be misinterpreted or be confusing?

Yes, sometimes FS may lead to misunderstanding in case the context is not clear. Although a majority of the kids employ it to imply the words, For Sure, adults or professional employees may take it in a different light, like Financial Services or Full Stop. Misunderstandings may occur in formal or in mixed-age talk. Educating children to think about their interlocutor and use complete words in cases when their vocabulary includes abbreviations is a way to avoid communication problems. Know more about what does fs mean