Gorram

A phonetic contraction of 'God damn' filtered through Firefly's frontier dialect. Fits the show's space-Western speech patterns.

Firefly (2002-2003, 14 episodes). Serenity (2005 film).

Achieved cultural penetration wildly disproportionate to the show's brief run. Fans regularly use it in real conversation — one of the most adopted fictional swear words in English.

Stable — no meaning shift. The show's single-season run gave no time for evolution.

Associated with the outer planets and frontier culture. Inner-world ('Core') characters would be less likely to use it.