Looks like puru is broken on algia.
Discussion
This is a way of expression like ¯\_(ツ)_/¯ and is called "Kaomoji".
It expresses "face" and "emotion" by combining letters and symbols, and Japanese people use this expression as much as emoji.
However, the meaning of "(((( ˙꒳˙ ))))プルプルプルプルプルプルプル" itself is not clearly understood even by the Japanese.
In any case, there is the aspect that they use it because it is fun😂
Correctly works. puru is equal to "プル". It doesn't make a sense.