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QUICK ANSWER
"Qué pasó" is a form of "qué pasó", a phrase which is often translated as "what happened". "Martín" is a proper noun which is often translated as "Martin". Learn more about the difference between "Martín" and "qué pasó" below.
qué pasó(
keh
pah
-
soh
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. what happened
¿Y? ¡Cuéntame! ¡Muero por saber qué pasó!So? Tell me! I'm anxious to hear what happened!