A person who is acting strange, wierd, funny, or just plain dumb.
Wow Lula, you're such a dumbnut.
by Blah! =P Oscar! April 24, 2010
2 more definitions
its a cross between dumb and nut. a freaktard, retard or plain stupid guy.
"ces is a dumb nut!" - quan
by d q master June 13, 2005
Noun. A cross between a dumbass and numbnuts.
You freaking dumbnuts!
by AL9000 January 24, 2009