This is a chanting that can be heard on every stadium, on every football match where the national team of Bulgaria plays.
Not so often it is used on rallies and protests. (especially anti-government ones, which are kinda traditional for Bulgaria).
BULGARI IUNACI, BULGARI IUNACI, BULGARI IUNACI.
And now there is attach on the right, good raid, a pass, Milanov, GOOOOOOOOOAAALLLL!!!!