- a mouth
- a person who speaks a lot
- (Norrland) a face
- (Östergötland) a part of something
- (Gästrikland) the flap on a cap
Frequently used negatively, especially in the first two definitions. Even the latter three usages are mostly colloquial.
- Mathias Strandberg (accessed 8 December 2019) , “Flabb”, in isof.se (in Swedish), Swedish Institute for Language and Folklore