http://www.wordmeaning.org/spanish/pirujo.htm pirujo, ja. 1. adj. El Salv. Que no cumple con sus deberes religiosos. 2. f. Mujer joven, libre y desenvuelta. 3. f. Méx. prostituta.

I use this word in a coloquial context to say witch, in form affectionately

It appears with several Latin American meanings in the DRAE, as Jesús has exposed them below. But here in Spain we only use that word in the expression "la Bruja Piruja", which is a humorous name for any typical fairy tale witch. You may also hear "la Bruja Pirulí".