"suay"

"Suay" is the Hokkien word for unlucky. Examples of use include:

• "This morning I took 5 minutes longer than usual to do my makeup. I went downstairs and JUST missed my bus and was late for work. So suay!"
• "Suay ah! Just now I was walking under a tree and a bird shat on me!!!"

"shiok"

"Shiok" is an expression of pleasure. It can be used in the following ways:

• "This laksa so shiok!"
• (After walking out of the heat into an air-conditioned room): "Shiok!"

"paiseh"

"Paiseh" is an expression of embarrassment or apology in Hokkien (a Chinese dialect). Sometimes used as "excuse me".

For example:

1. (After accidentally bumping into someone) "Paiseh paiseh, didn't see you standing there."
2. "The food is over there, no need paiseh, just help yourself!"
3. "Paiseh, can you help me with this?"

Source: http://singternet.wikia.com/wiki/Paiseh

"angmoh"

This is a racial label for white people. It literally means “red hair” in Hokkien (a Chinese dialect). The word can be used as a noun: if you’re white you’ll be called an angmoh. Singaporeans might also use this word as an adjective.  There are angmoh countries (USA, Britain, New Zealand, etc.), angmoh food, and angmoh movies.

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

"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/

"lah"

"Lah" in Singlish is a discourse particle in Linguistics terms, that is, a word or a particle that does not change the semantic meaning of the sentence, but for pragmatic functions such as indicating tone. Examples of Usage: "There's something here for everyone lah."

Lah is used to emphasize certain words and make sentences more emphatic.  You may hear Singaporeans say, “Cannot, lah” or “Don’t hurry, lah.”

Sources: 

1. https://www.quora.com/Why-do-Singaporeans-say-lah-at-the-end-of-every-sentence
2. http://www.cullenhartley.com/2009/05/10-singlish-words-to-learn/