1. disparaging term, short for a fucking crazy/nutty person
2. disparaging term for someone who's had their nuts fucked, or likes to fuck nuts, either human or squirrel food
1. Damned fucknut gave us too much homework.
2. No, i will NOT have sex with a fucknut.
Jollin: I wish I wasn't so lonely so I had someone to go grilling with. wanna come Lexus?
Lexus: heck yeah man! I'll bring my whole tub of infected cream cheese too!!
everyone: god these fucknuts