I’m currently reading the comic series L.E.G.I.O.N. '89, and the fact that sometimes every other word out of Gerryn Bek’s mouth seems to be Grok - either alone, or in the compound phrase ‘Grok-Bokker’, which is now my favourite insult - got me to thinking about the fictional obscenities and profanities in science fiction and fantasy - particularly comic books and television, which made me decide to build a list of the things - and, hey, the SDMB is always fun for help with this.
This list is off the top of my head…
L.E.G.I.O.N. ('89-R.E.B.E.L.S.'94):
Grok
Grok-Bokker
Feetal’s Giz(zard)
Legion of Superheroes:
(Sacred/Bloody) Liberty
Nykx
Grife
Sprock
Nass
Nass-Head
A couple of non-canonical Klingon curses (from the novel The Final Reflection) that I’ve found incorporated into my own vocabulary are g’dyaht (substitute for “damn” or “goddamn”) and kest (substitute for “fuck”).
From the Sten series : “Drakh”, meaning excrement.
From the Spellsong Cycle : “Dissonance”, as in to opposite of Harmony.
From the Pern books : “Shards”, referring to broken eggs possibly.
Also from the Sten series : “By my mother’s beard” and “By my fathers frozen buttocks”, along with “Your mother had no beard and your father had no buttocks”. These are from the Bhorr, basically alien Vikings/traders.
From Sheepfarmer’s Daughter : “Pargsli spakin i tokko”; it means “Jacks-hole full of soured witches’ milk”.