pashing off or to pash off means for a couple to engage in extensive kissing and groping action. This appears to be an Australian term used to describe any situation involving a man and a women, or more usually a boy and a girl, kissing for long periods of time interspersed with breast and groin grabbing.

Pashing requires the use of your kissing muscles, and the pleasure comes from the stimultaneous use of two cranial nerves: the seventh nerve (CN VII), aka facial nerve and the fifth nerve (CN V), aka trigeminal nerve.