Netizens in Taiwan have been tickled pink by a social media post about a man's grandmother who used the expensive handbag he bought her to go marketing.

The March 29 post on Chinese community network site Dcard, which went viral with over 31,000 shares, claimed that she was not aware that the bag was an iconic Louis Vuitton from the popular "Neverfull" range.

The bag retails for more than $1,000 in Singapore.

The man said he had wanted to treat his grandmother to a new and expensive handbag after seeing her carry the same one for many years.

But little did he expect her to greet him with the bag filled with groceries and fish after a trip to the market. She also praised the bag for being waterproof, albeit a little heavy.

Admitting that he was left "speechless" at first, he ultimately decided not to point out her mistake after seeing the happy smile on her face.

"Seeing my grandmother so happy is enough, and means I fulfilled my duties as a grandson," he wrote.

"I hugged her and reminded her to bring me along on her next trip to the market."