It's a common Samoan phrase used for:
* Counting: Literally, it means "three coconuts."
* Measurement: Traditionally, coconuts were used as a form of measurement in Samoa. So, "tasi fatolu" could refer to a specific volume or quantity.
* Symbolic Language: Coconuts are important in Samoan culture. The phrase could be used metaphorically to represent a group of three things, or to symbolize something related to coconuts.
Without more context, it's difficult to determine the precise meaning of "tasi fatolu" in a specific situation. If you have more information about where you encountered this phrase, I might be able to provide a more specific answer.