I fly like paper, get high like planes
If you catch me at the border, I got feces in my brain

The story:

I was at a tent trip with some friends, and I was playing guitar and singing. And that part of the song (+the chorus) is basically all I know, so I sang like "I fly like paper, get high like planes
If you catch me at the border, I got feces in my brain, lalalalalalaa, feces in my brain" throughout the whole verse, and suddenly all my friends were like laying on the ground laughing.
So I kept on singing cause I thought they thought the lyrics were funny, and yeah, they explained it to me...