Jenkem in English dictionary jenkem Meanings and definitions of "Jenkem" A purported hallucinogenic inhalant made from fermented sewage now exposed only as a hoax. noun A hallucinogenic inhalant made from fermented sewage. more Grammar and declension of Jenkem jenkem ( uncountable) more Jenkem Sample sentences with "Jenkem" Declension Stem Try again Available translations Finnish Norwegian Nynorsk Authors