Wiktionary
jill off
vb. (context coarse slang of a female English) To masturbate.
Usage examples of "jill off".
He slipped Jill off his lap, and as he stood up, his sword leapt into his hand as if by dweomer.
The way the man's eyes narrowed in recognition suddenly caught Jill off guard and made her think that perhaps she had not been wise in mentioning that fact.
While Jennantar went to draw rations for the three of them, Calonderiel helped Jill off with her chain mail.