From Wiktionary, the free dictionary
αν η γιαγιά μου είχε αρχίδια θα τη φώναζα παππού • (an i giagiá mou eíche archídia tha ti fónaza pappoú) ("If my granny had balls I'd call her grandad")
- (colloquial, humorous) if my aunt had balls, she'd be my uncle
