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QUICK ANSWER
"Chihuahua" is a form of "chihuahua", a noun which is often translated as "Chihuahua". "Ay" is a form of "ay", an interjection which is often translated as "ow". Learn more about the difference between "chihuahua" and "ay" below.
el chihuahua, la chihuahua, chihuahua()
This means that the noun can be masculine or feminine, depending on the gender of the noun it refers to (e.g., el doctor, la doctora).
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
a. dang (colloquial)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
¡Ay, chihuahua! Se me olvidó cerrar la puerta de la casa.Dang! I forgot to lock the front door.
b. shoot (colloquial)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
¡Chihuahua! Se nos acabó la leche.Shoot! We're out of milk.
ay()
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
b. jeez (colloquial)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
¡Ay! Me asustaste.Jeez! You scared me.
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).