a pig in a boat
a person who got tossed into a situation like a sack of crap and now they're stuck in it
My cousin went to a concert and now he's a pig in a boat. He didn't know how to dance.
I signed up for a marathon and now I'm a pig in a boat. I can't run.
My dog went to the beach and now he's a pig in a boat. He doesn't know how to swim.