not know one's ass from one's elbow

Definition of not know one's ass from one's elbow

chiefly US, informal + impolite

  1. :  to know nothing :  to be stupid Don't take his word for it—he doesn't know his ass from his elbow.

Word by Word Definitions

knowplay
  1. :  to perceive directly :  have direct cognition of

    :  to have understanding of

    :  to recognize the nature of :  discern

  1. :  knowledge

  1. :  any of several hardy gregarious (see gregarious 1a) African or Asian perissodactyl mammals (genus Equus) smaller than the horse and having long ears

    :  an African mammal (E. asinus) that is the ancestor of the donkey

    :  a stupid, obstinate, or perverse person

  1. :  buttocks

    :  anus

  1. : used as a postpositive intensive especially with words of derogatory implication

elbowplay
  1. :  the joint of the human arm

    :  a corresponding joint in the anterior limb of a lower vertebrate

    :  something (such as macaroni or an angular pipe fitting) resembling an elbow

  1. :  to push with the elbow :  jostle

    :  to shove aside by pushing with or as if with the elbow

    :  to force (one's way) by pushing with or as if with the elbow


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