If you thought you had heard every excuse in the book from a wedding guest, keep reading.

Taking to Reddit, one person shared pictures of the response their mum received to her 1981 wedding invite and it's really something.

In response, the unnamed guest wrote: "Sorry I'm strapped for cash trying to start my own business."

Fair enough, you might think. But wait, there's more.

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"If you're interested in feeling better through natural (nature packages, we distribute!) nutrition in 30 days money back guarantee, let me know," the response continued.

"I'll ship you into or products postage free! Thanks for the invite!"

To make matters worse, they even attached their business card, news.com.au reported.

The respondent began by explaining they were 'strapped' for cash. Photo / Reddit
The respondent began by explaining they were 'strapped' for cash. Photo / Reddit
And ended by asking the bride and groom to support their business. Photo / Reddit
And ended by asking the bride and groom to support their business. Photo / Reddit

"My mum was going through her old wedding mementos and found this response card from a relative. How tacky can you get?" the Reddit user captioned their post.

Other people agreed and labelled the response "so gross", with one Reddit user simply writing: "Dear god."

This is so terrible that it's kind of hilarious," another commented.

Meanwhile, others shared the hilarious excuses they received from people for their own wedding.

"My cousin turned down my wedding invite because I didn't want to join her Beach Body program to get in shape for the wedding after I told her I'm lazy and have a gym membership," one person wrote.

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BRIDE'S RSVP CARD FOR BIG DAY LABELLED 'TRASHY'

But it's not only guests under fire for their response to wedding invites.

Last August a woman shared her "less than traditional" save-the-date cards online that featured plenty of expletives.

Reddit user dimebag1976 posted a photo of her RSVP card, describing the decision to choose far-from-fluffy words along with a photo of the offending card.

"My fiance and I decided on RSVP's (sic) that are … well … less than traditional," she said.

The instructions then ask guests to check one of two options for attendance: "Abso F***ing Lutely" or "Not a God Damn Chance".

While intended as a joke, not everyone thought the cards were funny. Photo / Reddit
While intended as a joke, not everyone thought the cards were funny. Photo / Reddit

But the cheeky language wasn't over yet.

The card then prompts guests to "Check the Boxes Dumb A***s" in order for the bride and groom to know which events they will be attending on the big day – despite the fact there weren't any boxes on the card.

However, while clearly intended as a joke, the couple's card was slammed by social media users.

"This just seems trashy," one said.

"Cursing on an invitation isn't fun, it's rude and simple," another blasted. "Even if you don't mean it to be. Come up with something more clever and personal and it'll be more memorable," one said.

"This is the 'we're 30 years old and we aren't having a traditional wedding' starter kit," someone else joked.