I see lately this pose many times, is this some kind of meme or trend?

Yay... said:

I see lately this pose many times, is this some kind of meme of trend?

Kind of. My suspicion goes to Asanagi, but it could be someone else who started it.

Frawnkenstein said:

My suspicion goes to Asanagi, but it could be someone else who started it.

Actually it's arito_arayuru. More information is in standing_split wiki.