To eat with the loudest possible decibels and most disgusting mouth action ever know to man kind. Usually children owned by parents without table manners. Also a favorite of the elderly in community cafes. On rare occasions you will witness yopping by upstanding pillars of the community who often 'disappear' a few weeks later under mysterious circumstances.
You're yopping. Stop at once, move at once or prepareto be harmed.
a lot like the word chopper (fully automatic weapon,) made famous by lil wayne in his song "so dedicated"
except a yopper is a smg (sub machine gun) usually referring to a mac 11
pills, ecstasy, From Laotian word Yah-Bah which in translation to english means crazy medicine. (Say Yah-Bah fast enough and you will know where it came from)