皮皮虾，我们走
Pí pí xiā, wǒ men zǒu
This means to "Lets get a move on"
This long-lived and nonsensical meme has enjoyed enduring popularity likely because it is made up of two memes.
The "Let's go" part stems from the summons chant from Yu-Gi-Oh: Official Card Game, while the "mantis shrimp" with duplicated characters originally served as a nonsense word to express dissatisfaction.
Breaking down the phrase:
皮 refers to skin
虾 refers to prawns
我们走 refers to let us all go