Here are some possibilities:
* "Pesque" is a French verb that means "to fish." "Pesqueso" might be a misspelling of this word.
* "Pesquisar" is a Portuguese verb that means "to research" or "to investigate." "Pesqueso" could be a variation of this word.
To help me understand what you mean, could you please provide more context?
For example, tell me:
* Where did you see this word?
* What was the sentence it was in?
* What language are you trying to translate from?
Knowing this information will allow me to give you a more accurate answer.