It means that it looks like merengue. It is a thick or creamy preparation of milk to which eggs and sugar have been added.
1º_ Feminine of merengado . 2º_ Milk mixed with beaten egg white and sugar. 3º_ Brand of a traditional biscuit of the bagley company of Argentina. They are two layers of round vanilla biscuit and a filling of meringue cream with grated coconut. [Note: I was thinking if this fits the suspicion of espam, but the cookie is over 50 years old, and it is clear that you do not need it. ]
The meringue, also called meringue milk is a drink that is served cold, and that is prepared with milk, egg white, sugar, cinnamon and other flavouring.