SHIT SHIT SHIT. You flushed the toilet, and it's NOT WORKING.
Plunge the toilet by vigorously pushing in and out, keeping enough water in the bowl to cover the plunger. The ideal plunger has a extension flauge get a better suction, but of course when you bought your plunger (if you are lucky enough to have prepared in advance for this catastrophe) you were probably just looking for the cheapest and least embarrassing version to be caught shopping for, so this information is absolutely useless to you right now.
This step will not be effective because on today of all days, you had plans that you didn't want to include toilet clogging. As a courtesy to your friends, go ahead and cancel all social events for the day, citing "plumbing issues TOTALLY unrelated to poop."
To "loosen things up" in a panic, try flushing the toilet again. This will, of course, cause overflowing, you idiot.
With toilet water running all over your bathroom rugs, now is the to reach for the plunger once again. Be sure to try all different angles of plunging, requiring you to soak your hands in the poop water. You made this filth, now you must live in it.
IMPORTANT NOTE: Remember to yell "Just a minute" to your suspicious roommate. Let them think you're totally in control of the situation even though you are currently covered in shit water.
Discover you messed up all previous steps. Learn about different types of plunging snakes, but be too embarrassed and stressed out to actually purchase one. Instead, search for home remedies ... like ones that including pouring scalding hot water and dish soap?
WikiHow told you to, so it must be right.
In your head, imagine the conservation with your roommate and/or plumber where you'll have to explain why your poop is bubbly.
Even if you don't believe in a god, in your desperation now is the time to offer prayers of "Please just make this fucking shit flush and I'll singlehanded keep Activia and Raisin Bran in business for the rest of my life."
Wow, that actually worked this time. That was easy.
Use your roommate's towels to clean up all excess poop water. Hang dry.
While it's on your mind, now is the time to consider investing in a nicer plunger or a snake. Or you could do literally anything else not involving thinking about the terrible embarrassing nightmare you just lived.
Repeat all steps for the rest of your fiber-lacking life.