Numblefutz 

A way of calling someone a Spacko without actually saying it.

"Hey, Steve went to pay in a cheque at the bank and he was embarrassed in front of everyone because it wasn't signed. What a numblefutz."

Numblefutz by Pengle April 11, 2007

NumbLutz 

email-safe way to say someone is a 'numb nuts'

Resend that NumbLutz the original message from HR.

NumbLutz by keeprightexcepttopass May 11, 2010