A sexual act in which a person, using a turkey baster, injects equal parts of warm yogurt (must be Danon) and fruit into their partner's most anal of cavities. She (it's got to be a girl) defecates it into your mouth. Sometimes she poops a little too.
"Last night your mom gave me a Fruit-at-the-bottom. She crapped a little too. It was all liquidy. IT WAS DA BOMB! Then we listened to Mozart."