Abbreviation for "Laughing under my breath quietly," I came up with it because I thought of "Important Things with Demetri Martin." He used the phrase LTMQ, (laughing to myself quietly), which when I told someone about it they corrected me.
Person: Lol
Other Person: It wasn't that funny but it still was a little funny, lumbq.
by MatthewXploder June 04, 2011

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