Pdd stands for Pinduoduo Pinyin, and in e-sports, it refers to e-sports player Liu Mou. He is an e-sports player of League of Legends project, and his game ID is PDD.

Cpdd means "dealing with cp Didi", which means "looking for a personal group CP, please contact me if you are interested" or "dealing with someone, please contact me if you are interested".