estaban cachondeando
-they/you were petting
Imperfecto progresivo para el sujeto ellos/ellas/ustedes del verbo cachondear.

cachondear

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500+ learners.
Al parecer los dos amantes estaban cachondeando en el carro en ese momento.
The two lovers were apparently petting in the car at the time.
Palabra del día
el hacha