Hirni

From Hirn (“brain”) +‎ -i.

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Hirni m (strong, genitive Hirnis, plural Hirnis)

1. (colloquial, usually humorous) an idiot, someone who isn't quite right in the head (rarely employed as an insult, mostly a mild word for someone who has forgotten or misunderstood something)

   Nein, da fahren wir auf dem Rückweg vorbei, du Hirni! Sonst müssten wir ja dreimal hin- und herfahren...

   No, we'll drive by there on our way back, you dummy! Otherwise we'd have to drive back and forth three times...