Green’s Dictionary of Slang

Flanders n.

used in combs. stereotyping the Dutch as mean, hypocritical or deceitful.

In compounds

Flanders reckoning (n.)

spending money in a place that has no links to the place where one received the money.

T. Heywood If You Know Not Me, You Know No Body (1874) I 271: Spend it! God send me but once to finger it, and if I doe not make a Flanders reckoning on’t – and that is, as I haue heard mad wagges say, receiue it here, and reuell it away in another place.