Descartes' famous saying "I think, therefore I am" emphasizes human thinking ability and the cognition of existence derived from it. However, "I am a hybrid, so I am here" may be playing a pun, linking the verb "hybrid" with the concept of "existence" to form a humorous effect.
Please note that this is not the original intention of the songwriter, but the interpretation given by the audience or later. The original lyrics of Mayday should be different from this interpretation.