From the Persona series, a battle mechanic where when all enemies are in "Downed" status, the player is given an option for an "All-Out-Attack", triggering a graphic-cut in and a dust-clouded beat-up animation for high damage.
The sequence is often parodied by both Persona series and non-series alike. It is characterized by split facial profiles, along with often two red exclamation points, "!!".
Persona 4 parody iterations are subtly different from Persona 3 iterations. In Persona 4 parodies the characters sport glasses, whereas Persona 3 does not. Backgrounds are typically checker-patterned, and vary in color.
Persona 5 parodies are a significant departure from the 3 and 4 variants. Rather than the split-screen, character portraits are instead rendered on the debris from a shattered-screen effect. More commonly parodied from Persona 5 is the finishing screens that show up when the All-Out Attack finishes the fight, featuring the character that initiated the attack striking a pose while a personalized message appears on screen in a style specific to that character.
Please only use this tag for multiple characters in a picture, not for single expressions of !.