grandma panties
the huge saggy underwear, that your grandma, mom, or even you wear.
my grandma was wearing her grandma panties to the store.
empty as your grandma's panties
To be out of money; when one's wallet is void of currency.
Aaron: Hey Brian, you want me to get you a Cherry-Pepsi?
Brian: Sorry bud, check out my wallet...it's as empty as your Grandma's panties.
Brian: Sorry bud, check out my wallet...it's as empty as your Grandma's panties.