Past progressiveconjugation ofboo.There are other translations for this conjugation.

boo

I had no idea why they were booing.
No tenía ni idea de por qué abucheaban.
Over 80,000 of the 93,000 people in the stands were booing the home team.
Más de 80.000 de los 93.000 presentes en las tribunas estaban abucheando al equipo de casa.
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