The word desayunó is the preterite form of desayunar in the third person singular.
See the full desayunar conjugation

desayunar

No puede ni recordar lo que desayunó esta mañana.
He can't even remember what he had for breakfast this morning.
Esto es lo que desayunó esta mañana.
This is what he had for breakfast this morning.
La última vez que su familia desayunó junta.
The last time her family had breakfast together.
La última vez que su familia desayunó junta...
The last time her family had breakfast together...
Sí, ella ya desayunó y ahora se está vistiendo.
Yes, she's had breakfast and is getting dressed.
No lo sé, señor el tomó un buén desayunó.
I don't know, sir, he had a good breakfast.
Allá compró los periódicos del día y desayunó.
There, he purchased the morning newspapers and had breakfast.
Esta mañana a las 6:30, desayunó en Medusa. Hablé con la mesera.
At 6:30 this morning, he bought breakfast at Medusa diner.
El informe del alta dice que no desayunó.
Discharge report says he didn't eat his breakfast.
¿Por qué papá no desayunó con nosotros?
Why dad didn't drink coffee with us?
Sí, ella ya desayunó y ahora se está vistiendo.
She's had dreakfast and is getting dressed.
No desayunó, y comió poco al mediodía.
He ate no breakfast and but little at noontide.
¿Me puede decir qué desayunó el lunes?
Can you tell me what you had for breakfast on Monday?
Les tomaría meses solo saber que fue lo que hoy desayunó.
You'll need months just to figure out what she had for breakfast.
¿Qué desayunó esta mañana?
What did you have for breakfast this morning?
Lucas no desayunó esta mañana.
Lucas didn't eat breakfast this morning.
Y después dijo que paró en la ciudad, que desayunó. Sí, así es.
And then you said you stopped into town, you had breakfast.
No cree que recién desayunó.
He doesn't believe he just had his breakfast.
¿No desayunó nada esta mañana?
Didn't have any breakfast this morning?
Alguien desayunó muy bien esta mañana.
Somebody had their Wheaties this morning.
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