The act of one person(usually a female, or "femolly") sitting on the lap of another person and defecating through their open legs into a toilet. Variations include the substitution of a toilet for a person's face, or smallanimal.
"This is the last straw. Go get yo' girlfriend, we're going to femolly jonbomb on his face."
"I was thinking we could spice up our sex life. Let's try a femolly jonbomb after dinner tonight."