"makan"

Makan is the Malay word for eat.  Singaporeans will frequently say, “Let’s go makan.”  They also might invite you to a makan session.

Eating is, perhaps, the most important thing in Singaporean culture.  On many occasions I’ve been greeted the phrase “makan already?” instead of “hello” or “how are you?”

Source: http://www.cullenhartley.com/2009/05/10-singlish-words-to-learn/