A Kabe-Don (壁ドン) happens when one leans over another and slams the wall, creating a loud sound. This is used as a confession of love in manga, anime, and TV Drama.
In @dai_pld’s tweet, Yoshi-P does not forget the hard work of his subordinates. Yoshi-P asks if Soken is okay and would Soken like to rub his chest, it’s another meme.