Mousse is also (and I think this preceeds the hair product) a light and fluffy food concoction that can be either a
desert or a
fruit/
vegetable or
meat/
fish dish.
They are made fluffy by adding
whipped cream, whipped
egg whites and/or whipped
gelatin to a smooth base ingredient.
Commonly seen as a desert is chocolate mousse. The most common fish mousse I know of is
salmon mousse.