One of the dogs that you can choose at the start of Firewatch. It quickly became a meme on the Spanish community due to famous youtuber "Alexelcapo" broadcasting the game live. People quickly began doing jokes and spamming it in the twitch chat.
A few months after,youtube channel "Maskter" uploaded a parody of the song Redbone by Childish Gambino, using Alexelcapo's voice saying "Pipo" as the melody, combined with more voice lines from the streaming. The video has more than one million views. The song quickly spread and the meme became even stronger. Since then people have made similar videos featuring other songs. The youtuber has hosted English channels during his streamings, and some of them sung the Pipo song.
The youtuber even considers the meme as something "not normal", as he is tired of the meme. Still, people are still crazy with that meme, and it can be seen even on other Spanish channels.
A: "Hey dude, what's today's home-"
B: "Pipo pipo pipo pi piiiii"
A: "Fuck it, I will ask the teacher."