ok got this from a site.. thanks.
When i was young at my father's shop. He used to curse everytime
he's angry. His favourite curse word was BAGERO. BAGERO! everytime
he's pissed at sumthing like if the employees are lazy or somebody
moving too slow. After few years somebody told me that BAGERO was
actually BAKAYARO (The basic Japanese bad word). If you say fast
enough the word transform into BAGERO. Maybe that's what happen to
people who heard it in the first place maybe during Japanese came
to Malaya last time & the curse has been passed down. Another
possibility is my father,mother,auntie,uncle heard it from old
P.Ramlee movies. P.Ramlee is a famous Malay actor/film director
during the 60s,70s. Most of his movies you can hear BAGERO curse
here and there. That's why the older generation like parents,
aunties, uncles & the senior citizen know the word BAGERO &
use it either when they're angry or being silly. BAGERO!