The abbreviation for "genuine laughter was produced." The meaning is similar to "lol," but it means you actually laughed.
919-555-7542: Dude, my attractive female neighbor is completely paranoid. She thinks I'm following or even stalking her, she is worried that I may be obsessed with her and any time she hears a noise in her house she is...purified? Oh, wait... petrified. Sorry, it's not easy reading a diary through binoculars from a tree.

919-555-2457: GLWP
by THIS IS NOT MY REAL NAME July 2, 2012
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