An angry grandma slammed Subway for taking one hour to make 63 foot-long sandwiches.

The diner had placed the giant order to help cater family and friends at her grandson's confirmation party.

But after her wait, the woman whinged about the service online.

She left a scathing one-star review on TripAdvisor, in which she even moaned how staff at the branch "seemed really annoyed" at her huge order.

The full review read: "As a last minute resort me and my sister went to this Subway to get 63 footlong subs for my grandson's Confirmation party and had to wait over an hour for the subs!

"Ridiculously long wait and the lady who took my order seemed really annoyed with me."

But since posting the audacious rant, the gran, said to be from the US, has herself been mocked online.

Sharing a screenshot of the review, one Twitter user wrote: "Everyone who works in customer service should legally be allowed to fight one customer a year."

Others took to Twitter to share their fury today.

"Alternatively, I propose one day where retail employees can just unload on bad customers. Like the Purge, but for politeness," one social media user posted.

A third replied: "I bet after a decade or so I'd make it to January 3rd."

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