“Dirt on your head!”

Shame on you, you hopeless thing. Can be a real scolding, but between family and close friends it is often half fond and half exasperated.

Heard in the wild

باز کلیدتو جا گذاشتی؟ خاک تو سرت!

You left your keys behind again? Honestly, you hopeless thing!

A note

Throwing dust or earth on one's own head was an old gesture of grief and disgrace.

More teasing and scolding

دیگ به دیگ می‌گه روت سیاه
dig be dig mige rut siâh
“The pot tells the pot: your face is black!”
The pot calling the kettle black: said when someone criticises a fault they share.
موش تو سوراخ نمی‌رفت، جارو به دمش می‌بست
mush tu surâkh nemiraft, jâru be domesh mibast
“The mouse couldn't fit into its hole, so it tied a broom to its tail.”
Said of someone who can't manage their own affairs but piles on more, or drags others along with them.
برو کشکتو بساب
boro kashketo besâb
“Go and grind your kashk.”
Mind your own business, go away and do something useful.
منو سر کار گذاشتی؟
mano sar-e kâr gozâshti?
“Did you put me to work?”
Are you pulling my leg? Sar-e kâr gozâshtan means to prank someone or string them along.