(*ˊᵕˋ*)ﾉ□ﾍﾟﾀﾍﾟﾀｯ

The □ sitting between ﾉ and ﾍﾟﾀﾍﾟﾀｯ is the character Unicode names WHITE SQUARE, and ﾍﾟﾀﾍﾟﾀｯ itself reads as petapeta with a small ｯ at the end. In Japanese, petapeta describes pressing or sticking something flat onto a surface again and again, and haru, the verb for sticking, is also what people say for putting an image or a link into a post. That overlap fits how the face turned up on X: on two days in a row, someone put it at the start of posts that shared images recording time spent playing with friends. Everything up to the closing parenthesis, (*ˊᵕˋ*), is a face that is also used on its own, kept exactly as it is, and there are no spaces anywhere in the line.