What does "A face like a dropped pie" mean?
It means someone looks rough, unimpressed, or not their best. Said as a friendly roast between mates, not as a genuine insult.
The saying in a sentence
The saying
A face like a dropped pie
Example
My mate Bruce is a legend, but he has a face like a dropped pie (you only say this to a mate).
When you use it
Use it with mates who are already taking the piss out of each other, and only if they would laugh.
When you do not
Do not say it to a stranger, a boss, or anyone who would take it as a real insult.