The song's concept revolves around life in Gadsden, Alabama and the environment that the artist grew up in, as Yelawolf is essentially just describing his surroundings and the different events he's witnessed.
Yelawolf described in an interview that this track was actually the first one he wrote for Trunk Muzik, and the first verse was basically a nod to his stepfather, who raised him.
[2] The title of the song refers to a popular slang term which involves retrieving a firearm from the trunk of one's automobile.
His stepfather is fixing an old Chevrolet pickup truck, and eventually gets a Mossberg pump shotgun to shoot a burglar that has been trespassing on his property, thus 'popping the trunk'.
[3] "Pop the Trunk" is the song that Eminem's manager Paul Rosenberg showed him in a listening session before he signed with Shady Records.