being so incredibly horny it concerns everyone around them. Horny at anytime e.g dentist, school, just anywhere. Its incredible atrocious.
person 1: you’re so..horny now.
person 2: i got slug syndrome 😒
When you can't stop staring at someone or something, because it's so exquisitely grotesque, just like a slug.
This chick kept staring at me in class- I thought she was into me but it was just a case of Slug Syndrome.