Meanings: The word "maridillo" is not a standard term in Spanish and does not exist in the dictionary. It seems to be a diminutive, informal or colloquial term for "marido" which means "husband" in Spanish. The addition of the suffix "-illo" is a common way to make words more informal or diminutive in Spanish.
Usage: If used, it would likely be in informal or colloquial contexts, and its frequency of use would be low in the Spanish language. It would be more common in oral speech rather than in written context.
Verb Forms
"Maridillo" is a noun and does not have verb forms related to it.
Examples
Mi maridillo me sorprendió con un regalo de aniversario.
¿Dónde está tu maridillo? No lo vi en la reunión ayer.
Idiomatic Expressions
Since "maridillo" is not a standard term in Spanish, there are no specific idiomatic expressions associated with it.
Etymology
The word "maridillo" seems to be a playful or affectionate way of referring to a husband, derived from "marido," which comes from the Latin word "marītus."