Chelou!

While we've already briefly covered it, I tought I would shed more light on this one. louche (pronounced 'loosh'), as an adjective, means shady, seedy, fishy. E.g.:
c'est un type louche = he's a shady fellow
c'est plutôt louche = it's rather fishy

Its verlan version is widely used in slang
c'est chelou, je trouve plus mes clés = it's weird, I can't find my keys

As a feminine noun, it means a ladle /ladleful, and it is also slang for a hand:
il m'a serré la louche = he shook my hand

Finally, it is how we call the milky aspect of aniseed liquors lique pastis and absinthe, when water is added: