A stupid cunt with half a brain. For example, maybe used if someone does something stupid or makes a stupid decision
Daniel: "Bro your such a fucking halfnut"
Issac: "Fuck off, your the one in the lowest class you Half-nutted Fuckwitt"
Issac: "Fuck off, your the one in the lowest class you Half-nutted Fuckwitt"
by Jb_Jizznut January 31, 2010