sitzfleisch
/ˈzɪtsflaɪʃ/noun
mass noun
1- informal, chiefly US a person's buttocks〈非正式, 主美〉（人的）臀部, 屁股。
1.1
- power to endure or to persevere in an activity; staying power忍受力, 耐力。
词源
from German, from sitzen 'sit' + Fleisch 'flesh'.