I stay on track like a box of Pumas
Puma track shoes are used to run on race tracks, and the puma logo looks like a track
It’s also a clever simile: Pumas are a popular running shoe so therefore literally staying on track, similar to Wayne, either staying on the track (song) or how he has his life in order, contrary to the rumors. And it stays in the same rhyme scheme of the previous two lines.
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