A sense of impending
doom or extreme apprehension. Refers to
armpit perspiration that accompanies a frightening or uneasy situation. Used as an excalamation or a
noun.
"Pitters dude! I'm running on empty and it's a hundred miles to the
next gas station."
"I've got some irreversible pitters going about this project for work. My
boss has been riding my ass all week and I haven't
even started yet.