A phrase from a popular story where a
flute player practices too much and ends up hating the thing she loves. After being given a pickle that "gets rid of problems" she attempts to play for the king and her flute
disappears. Meaning her problem became her flute. This concert happened to be on a Tuesday in the story. This is used to say do not lose the enjoyment of
doing something by doing it too much.
Friend 1:
I just can't seem to wanna play this game anymore, I just get too stressed and always wanna win.
Friend 2: Well, they always say 'if there's a pickle in your pocket it is probably tuesday'.
You should probably just play for fun before it ruins
your love for playing.