LIQ
LIQ definition by Slang.net
This page explains what the acronym "LIQ" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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If someone responds to a humorous message you sent with LIQ, it means they are "laughing inside quietly." This person likely wants to LOL, but can't because doing so would be inappropriate.
For example, if you send your SO a funny video while they are at work, they may respond with LIQ. This means that your SO found the video you sent funny, but doesn't want to disrupt their workplace by laughing out loud.