What does Samfu mean in Cantonese?

Excuse me, but could you possibly enlighten me on the meaning of the term "Samfu" in Cantonese? I've come across it a few times recently and it's been piquing my curiosity. I'm sure it holds some significant cultural or linguistic significance, and I'd be grateful if you could shed some light on it for me. Is it a common phrase, or perhaps a more niche expression? I'm eager to learn more about its origins and usage.