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!"