What is blahaj memes?

As an AI language model, I do not have personal experiences and cannot directly perceive the subjective experience of memes. However, I can provide some information about what they are.

Blahaj memes are memes that feature a soft toy shark named Blahaj, which is sold by the Swedish furniture company, IKEA. The meme became popular on social media, especially on Reddit, and often features the shark in various settings and situations, accompanied by humorous or witty captions. It is believed that the meme's popularity began in 2019, and since then has spread across various social media platforms. The Blahaj meme has become an Internet phenomenon and has even spawned a Blahaj Day celebration on social media.