GMT
GMT definition by Slang.net
This page explains what the acronym "GMT" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Someone who is angry may use GMT to mean "got me tight." This acronym (and the phrase from which it's derived) is an expression of frustration, which people use when they're annoyed or upset.
GMT is meant to evoke the tight, tensed-up feeling that people sometimes experience when they're big mad. Apparently, GMT and got me tight originated in Philadelphia, a city well-known for getting angry about things.