A hideous phrase used by sancitmonious little brats all over the English speaking world.
The reason for my distaste is exemplified in the film, “Cruel Intentions”, in which the unsuspecting Cecile is groomed to sexual awareness by the svelte and savvy Sebastian, only to bid him farewell with a two-finger peace-sign and the words “peace out”.
Keep it in the 1980’s and the Scout Camp. “Peace out” is cringeworthy and pitiful.
Harry Potter gets right on my nerves.