1. a person's buttocks: informalUS"the bedspring tattooed waffles all over my Sitzfleisch"
▪ power to endure or to persevere in an activity; stamina:informalUS"I was given tasks which required lots of Sitzfleisch, but didn't offer much excitement"
Word Originfrom German, from sitzen ‘sit’ + Fleisch ‘flesh’.