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1.
RGTM is an abbreviation which stands for Random Good Times Moment. It is a form of 'text or chat language'. It is used when telling someone a good time they've had and It allows people to reminisce.
It can be used at the beginning or the end of the sentence and the memory is usually either explained or is a quote somebody said.
RGTM! "the door says to pull not push..."

or

Remember when we accidentally ran into that guy at the park? RGTM
by lollingbff December 06, 2010