estaban vitoreando
-they/you were cheering
Imperfecto progresivo para el sujeto ellos/ellas/ustedes del verbo vitorear.

vitorear

No era tu nombre el que estaban vitoreando allá afuera.
That wasn't your name they were chanting out there.
La CNN informó que los soldados y la multitud estaban vitoreando los unos a los otros.
CNN reported that the soldiers and the crowd were cheering each other.
Palabra del día
la rebaja