I think this song is a parody of (or tribute to) the song "Down" by Jay Sean ft. Lil' Wayne. Both songs have a similar theme and sound. "Down" has fairly innocent lyrics, but a hint of innuendo with the repeated and emphasized use of the word "Down". "In My Head" turns this around and makes the innuendo heavy and crude - it's meant to be over the top - in your face...so to speak.
I think this song is a parody of (or tribute to) the song "Down" by Jay Sean ft. Lil' Wayne. Both songs have a similar theme and sound. "Down" has fairly innocent lyrics, but a hint of innuendo with the repeated and emphasized use of the word "Down". "In My Head" turns this around and makes the innuendo heavy and crude - it's meant to be over the top - in your face...so to speak.