What is "lemonnation"

Daerek Hart, better known by his in-game name LemonNation, is a League of Legends player who is a the support for Cloud9 Challenger of the North American League of Legends Challenger Series (NA CS) and former coach of Cloud9's main LCS team. During his time on Cloud9, LemonNation mostly played the support role and helped C9 win two North American League of Legends Championship Series split titles and appeared in three consecutive League of Legends World Championships. He retired from playing on October 24, 2015 and became C9's coach. He was replaced as support by Hai "Hai" Lam, who switched over from the jungle position.

Not long after retiring he was announced for the roster of Cloud9 Tempest, C9's League of Legends Challenger Series (CS) team.