Top Definition
Norwegian for Bat.
Also the name for a non-specific sexual act. Flagger and mus can be taken individually to describe this sexual act in different ways.
Person A: Yeah, we're staying in a hotel this weekend and we're going to do the flaggermus
Person B: Oh I'd flagger his mus anyday
Person A: Yeah, he'd better watch out, I'm coming for his mus
Person B: With your nice big flagger
by freddietyrell May 12, 2016
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