Many people who use this term are unhappily surprised to learn that it's actually a derogatory ethnic slur - the proper spelling is "gypped", an unkind reference to the old belief that Gypsy or Roma people are deceitful and fraudulent in their business dealings.

In this specific case, it doesn't look like anything underhanded or misleading happened anyway, just an unexpected detour when navigating the complex world of cross-partnership mileage earnings.