A rank rump fed apple john, a person who has no regard for his or her own bodily smell or behavior. A pumpion generally makes an ass of themselves in every social situation and makes snide comments like calling overweight people 'blimps' or 'zepplins'. Despite all of a pumpions drawbacks a pumpion is necessary for a great time at every part due to the fact that they always end up doing some pumpion act and everyone gets to laugh at them.