Acronym for Johnny Just Come: Nigerian slang used to reference someone who is naive or new to a situation/place.

when you're hungover as shit after a spending a night drunk as a skunk

from a livestream in september 2019 from cowchop meaning

Nigerian slang used to describe a foreigner - usually a Westerner - recently arrived in country and who is often unfamiliar with local customs and therefore a target for 419 or scammers