This is the 8026th most frequent Portuguese word.
sasi
"Sasi" is not a standard Portuguese word. It may be a typo or a reference to "Saci," a mythical figure in Brazilian folklore.
Here, "Saci" refers to a proper noun, the name of a folkloric figure in Brazilian culture.
O Saci é um personagem folclórico brasileiro muito conhecido.
The Saci is a very well-known Brazilian folkloric character.
In this example, "Saci" is used to refer to the folkloric character in a general sense as part of a story or narrative.
Eu vi algo se mexendo entre as árvores, parecia um Saci.
I saw something moving among the trees; it seemed like a Saci.
The term "Saci" in this sentence is used to refer to the entity central to the tales being discussed.