One bro caught another bro sleeping with his girlfriend. Rather than duking it out or scowling in fury until one of them passed out from too much jaw-clenching, the two became fast friends and wrote a beautiful song about their beautiful love.
Unfortunately, in addition to their sweet love of one other, there's a hefty amount of misogyny, girl reviling, and STD allegations. (Bros! We know that you know that the best relationship is not one formed out of revenge, but out of shared experience and love.)
Regardless, their tale is one of old-fashioned American storytelling and bro-love creation, told through melodic human voices and the bro-iest of instrumentation (like three chords on a guitar).