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 small animal.
"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."