Literal: When some takes a stick, shoves it up the ass, and shits while the stick is still up their ass.
Fred: Ooh! look at that stick. Who wants shit on a stick?
Wyatt: Oh! I do.
Fred: Okay! look away....
Fred: Here you go!
Wyatt: Aww gross! It tastes and smelles like shit!
Fred: NO SHIT!
Shit on a stick, being a talking point. Why would shit be on a stick. If you feel like shit on a stick, you feel like people are talking about you... "how did shit get there, why is it there, thats gross etc etc"
"I was at this yuppie party, god i felt like shit on a stick."