LTM definition by Slang.net
This page explains what the acronym "LTM" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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LTM stands for "laughing to myself." Someone who sends you this acronym is quietly chuckling to themself, likely because of a humorous message you sent.
People use LTM (and laugh to themselves) in situations in which LOLing would be inappropriate. For example, if you send your friend a funny video while they're at work, they may respond with "LTM."
Don't worry - this doesn't mean your friend thinks the video you sent isn't funny. It just means they don't want to distract their co-workers (and/or draw attention to the fact they're watching funny videos at work).