Quick answer
"What's up" is a phrase which is often translated as "qué tal", and "hey" is an interjection which is often translated as "oye". Learn more about the difference between "what's up" and "hey" below.
what's up(
wuhts
 
uhp
)
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)
(used in questions)
a. qué tal
What's up? It's good to see you again.¿Qué tal? Me da gusto verte de nuevo.
b. qué pasa
Hey, Michael! What's up with you?¡Oye, Michael! ¿Qué pasa contigo?
c. qué hay
Rosita, what's up in town?Rosita, ¿qué hay en el pueblo?
d. qué onda
A word or phrase that is commonly used in conversational speech (e.g. skinny, grandma).
(colloquial)
Regionalism used in Latin America: all the countries in South America, Central America, and the Caribbean. Does not include Spain.
(Latin America)
Good morning, Fred! What's up?¡Buenos días, Fred! ¿Qué onda?
e. pasa algo
What's up? You look a little sick.¿Pasa algo? Te ves un poco mal.
2. (used in statements)
a. lo que pasa
They bought a new house. That's what's up with them.Compraron una casa nueva. Eso es lo que pasa con ellos.
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hey(
hey
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g. Wow!).
1.
A word or phrase that is commonly used in conversational speech (e.g. skinny, grandma).
(colloquial)
(used to call someone's attention)
a. oye
A word of phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g. How are you?).
(informal)
(singular)
Hey! What's wrong with you?¡Oye! ¿Qué te pasa?
b. eh
Hey! You can't eat here.¡Eh! No se puede comer aquí.
c. mira
A word of phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g. How are you?).
(informal)
(singular)
Hey! Don't step on the grass!¡Mira! ¡No pises el césped!
d. escucha
A word of phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g. How are you?).
(informal)
(singular)
Hey, I'm talking to you!¡Escucha! ¡Te estoy hablando!
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!
2. (greeting)
a. hola
Hey! How's it going?¡Hola! ¿Qué tal?
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