A joke at KFC

This is a real joke.

Place: KFC at Batu Buruk Beach, Kuala Terengganu (beside hospital)
People: My friend, JH and a Malay girl staff

So we queue up to wait for our turn to order. There are many people lah in front of us. Finally it's our turn yeah!
I ordered first, then it's JH's turn.

JH: Saya nak satu Dinner Plate.
Staff: Original ke Spicy? Drinks Pepsi?
JH: Spicy. Drinks nak Pepsi lah.
Staff: Ok so one Dinner Plate Spicy dan one Pepsi.
JH: Ya betul kak.
(So she go and prepare all of our orders.)
JH: Eh Chin Feung, do you know how to say chicken breast in Malay? (of course he spoke in mandarin with me lah)
Me: Errrrr.... I think is DADA.
JH: Em kak, nanti dulu, you ada BUAH DADA tak? Saya tak mau peha.
...........

OMG!!! the staff was shocked. People behind us start to laugh.
and.... I already run back to our table and can't stop laughing.

for those who not understand what I'm trying to say, please kindly ask someone who know Malay language to explain.