It isn't necessarily something that's quick to cook.

You could grab a quick meal in a restaurant when you're on your way to an appointment, the station or the theatre, for example. In this case, the meal is 'quick' from your perspective : it won't take you long to pop into a nearby restaurant, order today's 'special', wolf it down, pay and leave.  It might have taken the cook all day to prepare this dish, but it's still 'quick' as far as you're concerned.

A meal that is quick to prepare and quick to eat.

A sandwich is a quick meal.  (2 minutes to prepare, a few minutes to eat)

A salad is a quick meal.  (5 minutes to prepare, a few minutes to eat)

Spaghetti is a quick meal (15 minutes to prepare, a few minutes to eat)

@Sean and @Jennifer,

Thanks.

So it is something simple, fast in cooking, right?