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LTMN - An acronym standing for Laughing through my nose. LTMN is the point just before LOL. It is commonly heard in libraries and work places when people see something funny but it would be inappropriate to laugh out loud.
I didn't laugh but had one of those nose exhalations LTMN.

Dude that was funny picture LTMN.
by heyguysimisaac March 06, 2013
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