Usually used in forums where a controversial topic is being discussed. Opportunist posters will want to leave their mark by simply posting "IB4L" in the forum thread before the it is locked by forum administrator.
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Cantonese swear words - Tiu Nia Seng.
Can be replaced with Tiu Nia Ma. Literally means fuck your mother.
Dude 1: Hey, your gf is fugly.
Dude 2: TNS lah!!! Better than yours.
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