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Maybe one of these?
https://filmschoolrejects.com/8-glorious-tv-homages-to-the-geekery-of-dungeons-dragons-188a928c3885/
There's also a wikipedia page that lists a number of D&D-themed episodes of various shows: https://en.m.wikipedia.org/wiki/Dungeons_%26_Dragons_in_popular_culture
I think that was the Christina Applegate sitcom Jesse which ran for two seasons in The '90s.

I remember an episode of a TV show from the 2000s or late 90s about this woman who goes out with handsome guy and at the end he brings her to a group playing a tabletop RPG game like Dungeons & Dragons or some sort of similar stand in. The guy wears a cape and I think a pointy wizard cap and the other players are all your stereotypical fat nerdy types.
The woman is horrified about being there with nerds so she calls up her friend and her friend says her son plays it and the game only finishes when the in-game characters die. So she tries to get her character killed by attacking another player's character. A different player tries to save the other and after a dice roll the different player's character is decapitated and the head rolls into a lake.
Don't know the origin but I'm guessing American.
Edited by jormis29