This is the second video to not have a description, after SMG4: Lord Of The Memes. Instead, the description featured a promotion for the last chance to get season 2 merch on the SMG4 Shop.
While the preceding video is SMG4: Mario's Inside Story, a video was posted two days prior to this video entitled "SMG4: Goodbye Meggy" which was an April Fool's Day prank to fool fans that Meggy Spletzer was leaving SMG4. The video instead consisted of a Grand Theft Auto mod featuring Pickle Rick from Rick & Morty and the thumbnail of the video with someone shouting "doin' your mom" repeatedly. The video was quickly removed afterwards.
Mario's kicking of JubJub can be explained due to him blaming JubJub for losing his lunch (or making him hangry, a portmanteau of hungry and angry), which was the egg JubJub hatched from, therefore trying everything to make him seen gone.