Snacks and food samples that a grocery store will serve at various locations in order to tempt the patrons into buying something they weren't planning on (pizza, chips and dip, sausage, etc.).
        - I went to Costco the other day and filled up on store d'oeuvres.
Stopping at the store or usually a quickie mart to grab and throw down some snacks while on your way to eat at someone's house. Usually because you know there's going to be little or no good food there.
        - We better stop and grab some store d'oeuvres, you know that she never has enough food.  (on the way to a party at some chick's house)
        - Isn't she a vegetarian? We'd better stop and get some store d'oeuvres. I can't eat that shit all night.