It’s a fairly well known koamoji. Kaomoji is the horizontal counterpart to smileys and they can get very creative.

If you set your iPhone to Japanese keyboard it comes with hundreds of these build in

    ︎('ω'︎ )

Pro tip for iPhone users: juste type かおもじ (kaomoji) and slide the suggestion bar: you have all the kaomojis you want.

Bold to assume this person has an iPhone :)

I copy paste them :) http://japaneseemoticons.me/all-japanese-emoticons/

Apple users seem to think everyone uses Apple products.