The story
Apparently from English tiffing, present participle of tiff (“to take a small drink, to sip”) (slang).
Etymology from Wiktionary, CC BY-SA 4.0.
tiffin
tif·finToday it means: A (light) midday meal or snack; luncheon. Full definition →
Today it means: A (light) midday meal or snack; luncheon. Full definition →
Apparently from English tiffing, present participle of tiff (“to take a small drink, to sip”) (slang).
Etymology from Wiktionary, CC BY-SA 4.0.