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To get angry, frustrated, or irritated to the point that you suffer a tantrum of sorts
Anna: How was tennis, Tim?
Tim: Rubbish. I lost to Aidan. I should try and keep a level head and not go off my rocker when I play...
Anna: Yes. One should never go off one's rocker. Now it's time to eat some squirrel pie.
Tim: :l
by TimkinsTheTimTam December 30, 2011

Words related to Off one's rocker

nuts crazy insane mental non compos mentis psycho