Definition: Okay, here's a short, funny rhyme incorporating “shithappens” as you requested, aiming for cleverness and light-hearted absurdity:
Definition not found.
(Let's just say it means "things go wrong!")
My hamster wore a tiny hat,
Then promptly fell right off his mat.
A pigeon stole my blueberry pie,
Shithappens! Let’s just laugh and cry!
Shithappens! Let’s just laugh and cry!