The sordid sexual practice when a Welshman fornicates with a sheep on his way home after work, and then upon arriving home also enjoys coital relations with his wife/significant other, without first washing his spunk-trumpet.
The portmanteau taken from the conjoining of Welshmen with a penchant for sheep, with the French and their commonly accepted aversion to personal hygiene.
"Right, that's it Dai, I'm done for the day down these mines. I'm off home to give my Betty a good frelshing before tea, see?"
The "F" word substitute for the TV series Farscape. Using "Frelling" allowed the characters to swear at will making it seem natural.
Farscape (1999β2003) is a science fiction television series, featuring a present-day astronaut who accidentally travels through a wormhole to a distant galaxy on the other side of the Universe.
Example - Your favourite coat has just been ruined by a stray shot from a pulse pistol. "Frell! You've destroyed my frelling favourite coat you frelling piece of dren (qv)"