Word used all the time by Almost Everyone
noun • It’s a light sprinkling or drizzle of rain that lasts for days at a time, usually accompanied by fog
"Hoy hubo chipi-chipi todo el día, pero no llovió hasta las 7 de la noche."
"There was chipi-chipi all day today, but it didn’t rain for real until 7pm."
4 out of 4 Spanish, Castilian speakers have heard this