I'm still coming off the top of the dome
But it'd be on a tombstone if I wrote
To be coming off the top of the dome is a slang phrase that means to freestyle. The definition of freestyle varies from artist to artist. Some consider it to be the act of reciting pre memorized lines, but most consider it to be spontaneously rapping by creating the lyrics as you speak.
Wayne’s definition of off the top of the dome is unique in that he creates his lyrics while recording in the studio. This vid provides a better understanding of Wayne’s creative process:
Wayne is stating that he is still creating his lyrics without a pen and pad, but if he decided to start writing, it would be on a tombstone; in other words, he would kill it.
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