blumpkin in English dictionary blumpkin Meanings and definitions of "blumpkin" The act of performing fellatio while the recipient is defecating in a toilet. noun (vulgar, slang) The act of performing fellatio while the recipient is defecating in a toilet. more Grammar and declension of blumpkin blumpkin ( plural blumpkins) blumpkin (plural blumpkins) more Sample sentences with "blumpkin" Declension Stem Try again Authors