From Wiktionary, the free dictionary
Literally, “every walnut of the walnut tree”.
κάθε καρυδιάς καρύδι • (káthe karydiás karýdi)
- Tom, Dick and Harry
Τη νύχτα συναντάς κάθε καρυδιάς καρύδι.- Ti nýchta synantás káthe karydiás karýdi.
- At night you meet every Tom, Dick and Harry.