This is a word pun. the "Giza" in "Giza Mimi" comes from "Gizagiza" meaning "spiky", "Giza" is also a slang derivative of "Giga" meaning something like "mega". "giza kawayusu" meaning "mega cute" (kawayusu being a slurred form of "kawaii desu") is a phrase made popular by Nakagawa Shouko, the singer of this song and the voice actress of Pikachu-colored Pichu.
 Similar to the above, in this stanza "giza" is alternating meaning and the adjectives are mimicking the "kawayusu" form, "ureshisu" for "ureshii desu" and so on.
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