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Here's an explanation from Wikipedia:
Eton mess is a dessert of English origin consisting of a mixture of strawberries, pieces of meringue and cream, which is traditionally served at Eton College's annual prize-giving celebration picnic on the "Fourth of June" One anecdotal story is that the dessert was invented when a Labrador accidentally sat on a picnic basket in the back of a car on the way to a picnic.
Recipe:
-Crumble some meringues (pronounced murangoos as my sister Marlene and I would say)
-Mix them with whipped cream
-Add in some strawberries
-A few spoonfulls of strawberry jam
-Top with more sugar (if you're looking to have a heart attack)