nutbar adjective 1noun 1forms 1 adjective1 •(slang) Crazy, eccentric.Have Duncan and Richie been back together since Duncan went nutbar on us and tried for Richie's head? — 1996 noun1 •(slang) A crazy, eccentric person.If I’m alone and a warnik nutbar attacks me, so be it. But I will not sit idly by and watch as this country and the world are hijacked by the ultimate domestic terrorists in Washington. — 2003 formsnutbars
