a moment when one is laughing because of what one's colleague has said, which becomes an inside joke one cannot possibly explain to someone else- probably due to extreme laughter
Below is a roflmoment-
Teacher: Did I ever tell you you look like Harry Potter?

Student: Yeah, I've people have said that before.

Teacher: *Crosses student off attendance list and instead writes "Harry Potter"*
by FireIsHot-Ouch February 8, 2009
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