Someone who does something stupid or lame. Alsoo another way to say someone is gay.
1. Two men riding in the car listening to "Oops I Did It Again" <- those are fuzzynuts.
2. Lawerence: OooO look at the dudes butt...
Morris: You're a fuzzynut
3. Lawerence: Man, I was watching the porno and I WISH i could have a d**k like that guy!!!
Morris: Maaannnn.... I'm not saying you GAY, but that SOUNDS gay.... You a fuzzynut or something??