sex goblin

A nerd (especially one into sci-fi shows and science) who is always horny and regularly masturbates.

Emma: "Why isn't Bobby replying?"
Lili: "He's probably revising or wanking!"
*some time later*
Bobby: "Both :)"
Lili: "You're such a sex goblin"

Sex gremlin

An ‘intelligent person’ (some may call a nerd) who sabotages his (potential) intelligence in return for the sate/experience of being drunk (usually through drinking countless shots of pure vodka). This type of person regularly exercises, often too much to the point that their muscles spasm , particularly in the form of masturbating (especially to porn) .

Bobby: “What’s Jakub up to? He’s not responding to my messages. “
Lily: “He’s probably wanking, exercising or drinking.”
*Later*
Jakub: “All of ThE aBovE!!!!!!!!!!!!!!”
Emma: “You sound pissed”
Lily: “You’re such a sex gremlin”

Quote(from a sex gremlin): “Drinking isn’t about enjoyment, it’s about getting hammered as quickly as possible”