"All is fair in love and war". The meaning is, anything you do in the name of love is fair. Note, that 'fair' does not mean 'right' or 'correct'!
This phrase is spin of the expression "all is fair in love and war", which is an expression that means anything goes in winning at love or war. Your phrase simply replaced war with basketball, only to be cute and most likely because someone has a passion for basketball. Your phrase really has no meaning, it's simply someone trying to sound cute and most likely has no idea what the phrase means either.
All is fair when love is war
if your talking about all is fair in love and war they mean everything goes as in there no wrong in love or war everything is fair play
Love conquers all.
This phrase means "the love of Christ conquers all"
All's Fair in Love - 1921 was released on: USA: September 1921
I love you with all my heart
All's Fair in Love - 1909 was released on: USA: 29 October 1909
All's Fair in Love and Work - 2010 was released on: USA: November 2011
it means someone loves you then hates you after awhile and then hates you and loves you all over again.