Where does “Xflop” come from?

Xflop (English) comes from English FLOP, from English floating-point operation — Alternative form of floating point operation.

Ancestry of “Xflop”, step by step

Xflop traces back through two separate lines of ancestry.

via English FLOP

StepLanguageWordMeaning
1EnglishFLOPSynonym of flop
2Englishfloating-point operationAlternative form of floating point operation

via English Xbox

StepLanguageWordMeaning
1EnglishXboxAny of the home consoles in Microsoft's "Xbox"...
Every word from English floating-point operationEvery word from English FLOP