This can be applied to many things: you can chamuyar an exam or a job interview if you get your way around it saying whatever comes to your mind, but intelligently; or you can chamuyar someone, thats is, trying to make them your love partner.
"¿Qué tal te fue el examen de ayer?" "Ah pues tuve que chamuyar, no me sabía nada"
"How did you do at your exam yesterday?" "Oh I had to chamuyar, I didn't know a thing"