I'm certain this story was no later than 1980, and written in the 1950s-60s is probably much more like it. I'm pretty sure I read it in a collection rather than a magazine, but of course that could have been a reprint. English language.
Our protagonist and two or so friends are touring some sort of off-Earth habitat -- I seem to recall something on the order of domes + connecting tubes on the moon, although it could have been Mars. Crucially, the habitat is pressurized, with vacuum outside, and our heroes don't have pressure suits. The tube they are in is isolated by pressure doors in response to, maybe, a moonquake? No problem, they plan to just wait an hour or two until the repair crew gets to them. (They also have no communications for some reason.) But then the corridor wall is punctured by a micrometeorite. (I recall that the isolation and the vacuum leak were separate events, although I could be wrong.) So now they are in a small, leaking, tube -- OMG! -- until one character, notably portly, volunteers to drop trou and seal the small leak with his buttocks. Rescue eventually arrives, everyone is happy, the "hero" escapes with only some frostbite.
I'd thought it was by Asimov, and maybe it is, but I can't find it. It's certainly similar to many of his minor stories in that there's no characterization, no worldbuilding, just Idea: problem. Idea: solution. I may have read it at the same time as, or same collection as, some of his Wendell Urth stories?