Got a fighter jet, I don't get to fly it though
Here, he’s just telling a blatant lie to imply what he said about this person was a lie, too.
Also, being with a girl who don’t love you back is like having a fighter jet you aren’t allowed to fly… A constant reminder of your limitations.
The fighter jet that he don’t get to fly could even refer to his penis, which he doesn’t get to use in this particular relationship.
The line could also say that Frank doesn’t have time to do anything, even fly that awesome fighter jet he has. He’s always got this person on his mind, so he’s always occupied lying down Thinkin' Bout them.
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