Of, relating to, or characteristic of a picnic; (now esp.) befitting a picnic, relaxed, convivial.

As a modifier, designating what is considered to be customary among or characteristic of Gypsies, esp. having meals in the open air or travelling…

Of the nature of or suitable for a picnic.

Of, relating to, or reminiscent of a picnic; characterized by picnics.

Of a meal: pre-prepared and packaged for transporting and eating away from home. Frequently in packed lunch.

a plain brown paper-bag, esp. one in which a lunch is packed and carried to a work-place, meeting, etc.: frequently attributive, esp. as brown-bag…

Designating a packed lunch. Now rare.

Applied to refreshment stops, etc., made during the course of a journey or outing and arranged at the open tailgate of a parked car.