The word disfrazábamos is the imperfect form of disfrazar in the first person plural.
See the full disfrazar conjugation

disfrazar

Nos disfrazábamos y montábamos obras de teatro en las escaleras.
We'd dress up and put on these plays at the top of the stairs.
¿Te acuerdas de cuando le disfrazábamos?
Remember how we used to dress him up?
¿Por qué nos disfrazábamos?
Why did we dress up?
Quiero decir, nos disfrazábamos como superhéroes. y nos perseguíamos el uno al otro en el patio.
I mean, we used to dress up like superheroes and chase each other around the playground.
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