Freeboot

verb
Recreational use of the anti-cancer drug Reboot™ for the purpose of experiencing its notable gender-reassignment side effect.
Source
Changes

Frelk

noun informal
A person who is sexually attracted to spacers.
Origin
Abbreviation of ‘free-fall-sexual-displacement complex’.
Source
Aye, and Gomorrah…

Frood

noun informal
A really amazingly together guy.
Source
The Hitchhiker’s Guide to the Galaxy

Galaktika

noun
The shared language of the League of All Worlds.
Origin
Corruption of ‘galactic’.
Source
City of Illusions

Gelf

noun
Acronym of “genetically-engineered life form”.
Source
Red Dwarf

Genofix

verb
To genetically modify a life form in order to enhance its natural anatomy and physiology.
Source
Consider Phlebas

Geophone

noun
A listening device that detects vibrations in bedrock.
Origin
Formed from geo (Earth) and phone (sound).
Source
The Stars My Destination

Geotect

noun
A person who designs the topography of artificial land masses.
Origin
Formed from geo (Earth) and téktōn (builder).
Source
The Diamond Age

Ghostbuster

noun
A professional paranormal investigator and exterminator.
Source
Ghostbusters

Gigadeathcrime

noun
A criminal act causing billions of deaths.
Source
Excession

Gimboid

noun informal
An incompetent person.
Origin
Possibly a pairing of ‘gimp’ and the suffix -oid (resembling).
Source
Red Dwarf

Girdlecity

noun proper
A city that encircles a planet.
Source
The Hydrogen Sonata