@ren male in the same sense autism has been called "extreme male brain"
so based on the patterns of thought often correlated with observably higher prenatal testosterone exposure
also based on what has historically rewarded men socially which is conquest and subsumption of externalities
and finally in a more universal descriptive metaphysical sense that anyone can possess that's a nod to an essentialist masculinity (the last is perhaps most evocative but to be taken least seriously)