To suddenly go crazy with no apparent provocation. Especially true with emotional issues that have not been previously resolved but avoided.
by CWB September 18, 2005
Get the nut upmug. by Redneck Hemingway July 18, 2016
Get the nutting upmug. by wstsdgrl March 12, 2008
Get the nutted upmug. by F.I.D.O. July 22, 2006
Get the nut upmug. v. To ejaculate. Literally, when one's testis climb to a "high & tight" position just before launch.
by R2dad August 1, 2006
Get the nut upmug.
Get the Nutted upmug. by lost shadow kid April 1, 2010
Get the Nut Up or Shut Upmug.