Its what you say to Neo Nazis, incels and so called gnome hunter's on TikTok, for example:
Dude 1: "Now yuo see" / "aryan classic"
Dude 2: "Take ten deep breaths underwater, you fascist cunt"
4s up means you're madly in love with emily and you would love to kiss her rn
OMG GEORGE IS SO COOL HES THROWING 4S UP- george