GR
GR definition by Slang.net - The Slang Dictionary
This page explains what the acronym "GR" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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When someone tells you they GR, it means they "gotta run." This means the person you're talking to has somewhere else to be, and they can't continue talking with you.
More commonly, you'll see people use G2G to end conversations when they have somewhere to be. However, GR is a character shorter, and may be used when someone who's gotta run is really in a hurry.