Definition of keister in English:

keister

Line breaks: keis|ter
Pronunciation: /ˈkiːstə
 
/
(also keester)

noun

North American informal
1A person’s buttocks: I’ve had it up to my keister with all these leaks
More example sentences
  • There are also a surprising number of people who wouldn't recognize a joke if it walked up and slapped them on the keister.
  • You'll rest your tired keister at night in some of the Alps most inviting resorts and inns.
  • It's an all-natural blend of minerals, herbs and oils to soothe your keister and make it kissably fresh.
2 dated A suitcase, bag, or box for carrying possessions or merchandise.

Origin

late 19th century (in sense 2): of unknown origin.

Definition of keister in:

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Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal