The action of playing with fecal matter, including, but not limited to eating, cooking, rubbing & building.
Callum: "Want to flef later?"
Tom: "Ew, no that's disgusting."
The act of using fecal matter in various ways such as eating, cooking & playing.
Martin: 'Hey, want to flef a fresh hotdog roll with me?'
Callum: 'Sounds great!"