The story
Blend of Kaminari (上鳴) and Deku (でく, alternate kun'yomi reading of 出久 Izuku, homophonous with 木偶).
Etymology from Wiktionary, CC BY-SA 4.0.
KamiDeku
Today it means: The ship of characters Denki Kaminari and Izuku "Deku" Midoriya from the My Hero Academia series. Full definition →