فکر کنم کلمه go dutch ربطی به ازدواج نداره و به معنی هرکس پول و سهم خودش رو حساب کنه هست(دنگی حساب کردن) اکثرا در رستوران استفاده می شه
Going Dutch is a slang term indicating that each person participating in a shared activity pays for himself or herself, rather than any one person paying for anyone else. It is also called Dutch date and Dutch Treat.