Spinach aftertaste

[pre]

Whats the word describing the residue film that sits on your tongue after eating a moderate to large amount. There was a particularly educated word I had learnt (possibly from the film Sideways but I could be wrong) beginning with the letter m but it's being bugging me all day.

[Nick]

Mingage?

[pre]

Come on! help a man and his errr... vocabulary!