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QUICK ANSWER
"Hey" is a form of "hey", an interjection which is often translated as "oye". "What's going on?" is a phrase which is often translated as "¿Qué pasa?". Learn more about the difference between "hey" and "What's going on?" below.
hey(
hey
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
1.
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
(colloquial)
(used to attract attention)
a. oye
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
(informal)
A word or phrase that is singular (e.g., el gato).
(singular)
Hey! What's wrong with you?¡Oye! ¿Qué te pasa?
b. oiga
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
(formal)
A word or phrase that is singular (e.g., el gato).
(singular)
Hey! You can't park there.¡Oiga! Ahí no se puede estacionar.
c. oigan
A word or phrase that is plural (e.g., los libros).
(plural)
Hey! Don't step on the grass!¡Oigan! ¡No pisen el césped!
d. eh
Hey! You can't eat here.¡Eh! No se puede comer aquí.
e. ole
Regionalism used in Colombia
(Colombia)
Hey, don't talk to me like that!¡Ole! ¡No me hables así!
f. hala
Regionalism used in Colombia
(Colombia)
Hey, don't feed the dog!¡Hala! ¡No le des comida al perro!
g. momentito
Regionalism used in Argentina
(Argentina)
Hey, don't cut in line!¡Momentito! ¡No te cueles!
a. hola
Hey! How's it going?¡Hola! ¿Qué tal?
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What's going on?(
wuhts
 
go
-
ihng
 
an
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
1.
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
(colloquial)
(greeting)
a. ¿Qué pasa?
Hey, it's good to see you! What's going on?¡Es un gusto verte! ¿Qué pasa?
b. ¿Qué tal?
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
(colloquial)
I haven't seen you in a while. What's going on?No te he visto desde hace un momento. ¿Qué tal?
a. ¿Qué está pasando?
What's that smell? What's going on?¿Qué es este olor? ¿Qué está pasando?
b. ¿Qué está sucediendo?
What's going on with you and Derek? He told me you haven't spoken since Saturday.¿Qué está sucediendo entre Derek y ti? Él me dijo qué ustedes no han hablado desde el sábado.
c. ¿Qué está ocurriendo?
What's going on in your city? The news makes it seem so scary.¿Qué está ocurriendo en tu ciudad? Las noticias lo hacen parecer tan aterrador.
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