You may remember that the prefix non- means “not” by using the phrase nonpoisonous, for any compound that is certainly nonpoisonous is “not” poisonous. Being an interjection to negate what was mentioned prior to or reveal it as sarcasm, it is actually attested by 1900, popularized 1989 by "Wayne's Earth" https://juliuswekpv.wikiworldstock.com/688187/5_essential_elements_for_baumwolltaschen