ctm, acronym of the phrase, "Chuckling To Myself".
Origins circa 1998.
Use arouse from instant messaging through Yahoo! messenger.
Where when realised rarely anyone actually 'Laughs Out Loud' (lol), the more truthful & correctly expressive of ones behaviour 'Chuckling to Myself' was applied to messages instead.
Sean: Two fish swim into a concrete wall. One turns to the other & says "Dam!"
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