Top definition
Laughing Behind The Monitor.

When someone says something funny on irc/im or in an email and you end up laughing behind your monitor screen whilst trying to hide it from colleagues in the office..
Person 1: that's such a funny thing isn't it?
Person 2: /me lbtms
Person 3: oh you bastard, im lbtming now!
by lbtmer January 25, 2011
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