A combination of "on god" and "lah," essentially taking on the meaning of the former but with the Chinese aesthetic of the latter.
Example 1:

Person: "Ayyo round-eye!"
Person2: "What?"
Person: "I'll smack the dog shit out yo dumb ass on lah!"

Example 2:

Person: "That bitch fine af."
Person2: "On lah."
Person3: "Fr."
Person4: "Y'all gay af bruh that's a tranny!"
by onlah April 17, 2022
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A vile and loathsome mixture of fecal matter and semen, worn as a disgusting excuse for lip-gloss by strange transvestites claiming to be from Las Vegas, East L.A. and Hawaii but who are in fact illegal aliens from the Spain-Gibraltar-Morocco region.
So, how much is this gonna be? Oh God... Lah lah lah.... PUKE!
by beninski August 23, 2010
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a slang used mainly by people of South-East Asia (Malaysia and Singapore mainly) to complement almost any sentence available in a social conversation. the origins of this slang is basically from the chinese language, yet it is now used by almost anyone in the two countries mentioned above who aren't too shy to let their asian roots shine with pride. people who don't use the -lah slang is considered a snob to a certain degree.
A: Hey, can you lend me five ringgit?
B: sorry lah, I need money to pay for my cab and lunch-lah

C: can you help me for a minute?
D: ok-lah.
by calV May 1, 2005
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A suffix of no standard meaning used by Malaysians in their very own version of the english language (affectionately named Manglish) to spice up sentences and to express very different meanings according to the way it is said.

adopted from the Malay language and widely used by Malaysians regardless of race.

also used as an "economiser" that shortens sentences by 80 percent.
come on, lah!
translation: "come on, don't be shy" or "come on, don't waste anymore time"

ok-lah
translation: "Okay, okay, I'm sorry" (if said in apologetic manner)

examples listed above are not sufficient to fully understand the deep and intimate meaning of "lah". Contact a Malaysian friend for phonetic guide and a proper understanding of this mysterious syllable.
by Easy February 7, 2005
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Slang. Malaysian/ singaporean colloqial language. A suffix to place emphasis on the sentence/word before.
Also, la, leh, ler, le, laa.
Is she your girlfriend?
No lah!!! That one is Jimmy's one lah.

He is crazy one lah!

This chow kuey tiaw (fried rice noodles) is the best one in town lah.
by SthEstAzn January 2, 2008
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A infamous word used by youtuber Amberlynn Reid
Person: I don’t like you

Amberlynn: YOU A LAH!
by C0R0NAVIRUS March 15, 2020
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What many Singaporeans say at the end of a sentence.
I will call a taxi lah
by JDMac12 May 22, 2019
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