1. Get contact lens by clicking an eye, then enter the mouth.
2. Press the button and immediately use the lense to protect yourself from the acid(?). Get the pills.
3. Go to the next area and use the pills to dissolve the meat. 
4. Kick the smiley to supercharge it (or whatever). Get it. 
5. Get the umbrella.
6. Go to the next area and use the smiley. It will kill all frownys and open the way.
7. Pull the cord and get washed down along with the turd/bomb (if you did all this too slowly the bomb will eventually explode and kill you - see the timer at the side of the game)
8. Use the umbrella to hook your way out of the path of the turd or be smushed into the toilet bowl.

The End.