It came from Turkish and means "come on, let's": "Айде на кафе!"
(let's go for a coffee). It also wraps up a conversation: "Айде, чао!"
(right then, bye!). Said impatiently — "Айде де!"
— it means "oh, come on already!" The word is informal: in formal situations just say "Довиждане"
.
Explore Bulgaria
Ayde — come on!
"Айде"
(or "хайде"
) is one of the most useful words in Bulgarian.

History of Bulgaria
An illustrated history of Bulgaria
Explore Bulgaria

Sharon Hahn Darlin · CC BY 2.0 · Source
Ayran
"Айрян"
is a cold drink made of yoghurt, water and a pinch of salt.

Shake for yes?
Traditionally, Bulgarians shake their head from side to side to mean "да"
(yes) and nod to mean "не"
(no).

borzo · CC BY-SA 3.0 · Source
Banitsa
"Баница"
is thin layered pastry baked with eggs and "сирене"
(white brined cheese).