here are two(2) favorite sitzfleisch quotes:

"They simply hadn't enough Sitzfleisch to squat
under a bho-tree and get to Nirvana by contemplating
anything, least of all their own navel."
- D. H. Lawrence, Things (1928)

"I am always careful to pack a can of sitzfleisch
whenever I have to go to the post office or visit a
friend who wants to show me his entire collection of
baby pictures."
- Ammon Shea, Reading the OED (2008)