When you take a shit that looks like a ball. Smells worse than any other shit you've ever taken. Often times found after Mexican food. Also see diarrhea.
My meal at Taco Bell was delicious, but they didn't quite like me leaving a Stinky Bubble in their bathroom.
When a man does anal with a girl and makes her bleed analy on his dick, then puts his blood-covered dick in her mouth. Then he cums in her mouth, mixing the white cum with the red blood, turning it pink. The girl now has a bubblegum looking substance in her mouth, she then proceeds to blow a cum bubble with the "bubblegum", therefore completing the the bubblegum effect.
I was having anal sex with my girlfriend last night and she started bleeding and I was about to cum so I decided to give her a "bubblegum stick".