Be De Vietnamese

What is the meaning of this Vietnamese Gulf Day in English?

At school, people at my desk made fun of a boy named Tony and told him in Vietnamese that today was Gulf Day. I think the spelling bƒÂª in Vietnamese sounds like that. what is the meaning of this?

Be cruel, like when a minor says you are insulted.

Be De Vietnamese

As the Vietnamese language spoken is partly influenced by French, I think it is derived from the French word pad, ual for French colloquialism. The word spoken is pedrast.
Baby means doll. I don't know what the other word is.