The two pink squishy balls between a mans legs. Men find it highly pleasurable when these are gently stroked, sucked or fondled, however, they become agitated when they are in danger, and may even kill in order to protect them.
Being an idiot. When someone says something exceptionally stupid and/or just in general acting dumb. Someone who is a "fluppsen" often acts as if he knows a lot and knows about things, but can often be proven wrong by simply questioning him/her.
A synonym for tired or exhausted. It might be accompanied by an overwhelming urge to do nothing more than chill out at home on the sofa / couch and do nothing,