The combination of lekvar, a thick prune puree used to fill cakes or cookies and the rectal elimination of gas. Commonly referred as a wet fart or shart, this is socially unacceptable and uncomfortable.
Ted: Yo Dude, it looks like you have some lekvar running down your leg.
Fred: Damn, I was trying to sneak one out, but it was a lekfart. Help me find a toilet.