ambient snacking
n. Snacking on foods that can be stored and served at room temperature.
Other Forms
Examples
2016
Responding to the torrent of furious messages, Sainsbury’s said via social media:…

"We’re also including 14 new ambient snacking lines, all at 50p and under 150 calories each, tapping into the healthy snacking trend."
—Adam Boult, “Sainsbury’s '£3 meal deal' change prompts fury among customers,” The Telegraph (London), September 06, 2016
2014
We focus on ambient snacking — primarily fruit-based.
—Hannah Abdulla, “The bitesize interview — The Kids Food Co. CEO Sally Preston,” just-food, July 16, 2014
2013
Paul also wanted to do something a little different and has installed shelving displaying ambient snacking between single-serve chilled drinks and chilled snacking offerings.
—“Malcolm's KwikSave, Chelmsley Wood,” Convenience Store, December 23, 2013
2010 (earliest)
Unearthed, a premium food and snacking brand is launching a range of new products for summer based on tapas and ambient snacking.
—Jeffrey Hyman, “New snacking products launched by Unearthed,” The Food & Drink Innovation Network, May 17, 2010
Notes
Other trolley features include a lockable cash drawer, logo board, ambient snack display area on the trolley top and two wheel brakes.
—“Caterer & Hotelkeeper, Volume 175,” IPC Consumer Industries Press, January 01, 1984