What does "Saturdays are for the Boys" mean?

thisjourney
I've been hearing a lot of guys say that Saturdays are for the boys. Where did this phrase come from and what does it mean? lol. Is it a day where all single guys like party and go crazy or is it a day for guys in a relationship to get away from their girlfriends lol. I be seeing the posts all over the place. lol
What does "Saturdays are for the Boys" mean?
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