When someone says he or she is going on a "beer run" it means that he or she is going to the store to purchase beer. In the poem, the speaker says that because he went on a beer run and therefore brought back beer for everyone that he now has the right to stay where he is when previously he had not had that right. Therefore the speaker could now, "Tune up and play" which means he could now tune up his musical instrument and play it because he could stay.
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hmea1 Therefore the speaker could now, "Tune up and play" which means he could now tune up his musical instrument and play it because he could stay.