The word vuelcas is the present form of volcar in the second person singular.
See the full volcar conjugation

volcar

¿Por qué no te vuelcas solo en la misión?
Why don't you just stick to the mission?
¿Por qué no te vuelcas solo en la misión?
Why don't you just stick to the mission?
¿Qué tal si te vuelcas, y "eso" se sale?
What if you turn over and it falls out?
Si tú no te vuelcas al lado oscuro quizá ella sí lo haga.
If you will not turn to the dark side... then perhaps she will.
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