The lyrics of "Defenestration Song" by Have A Nice Life explore feelings of restlessness and being trapped by one's own nature. The word "defenestration" means to throw someone out of a window, which could represent a desire to escape or break free from a situation. The repetition of the phrase "get off my back" suggests a need for independence and space. The singer reflects on their own mortality, not expecting to live this long, and feeling like a sacrifice or burden. They question whether this is what life is really like and wonder if it will always be this way. Overall, the song seems to be about feeling stuck in a certain way of living or thinking, wanting to break free from it, and questioning whether life will always feel this way.