A "Fjopenisse" is a person (usually Norwegian) who dousaint know basic human interacton or is unabel to do as they are told without messing up.
*Fritjof is eating taco on a friday, and spills the taco souce all over the table*

Katrine: Fritjof! You fucking fjompenisse!
Fritjof: *starts crying, and runs to the bathromm*
by nissefjomp February 24, 2019
Get the fjompenisse mug.