portafuelnoun.
A portable and nutritious meal or snack.
Example Citation:
"Raymond sees opportunities for more 'portafuels,' foods that are both portable and healthful, such as Athenos Foods' new pita triangles and hummus that comes in a compartmentalized plastic container."
Carole Sugarman, "2001 A Consumer Odyssey," The Washington Post, January 3, 2001