The word pesabas is the imperfect form of pesar in the second person singular. There are other translations for this conjugation.
See the full pesar conjugation

pesar

¿donde pesabas que he estado los pasados cinco años?
Where do you think I've been for the past five years?
No importa cuánto pesabas en la secundaria.
No matter what you weighed in high school.
¿Cuánto crees que pesabas en 1975?
What do you think your weight was in 1975?
¿Cuánto pesabas la última vez?
What was the last time we weighed you at?
Pesabas menos de lo normal cuando naciste, pero creciste rápido.
You were underweight when you were born, but you grew quickly.
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