TAC
TAC definition by Slang.net - The Slang Dictionary
This page explains what the acronym "TAC" 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 you want to succinctly say something is disappointing, you can use TAC to stand for "that ain't cool." TAC is a legit way of expressing your frustration with an action or turn of events.
Things TAC include (but are not limited to):
If any of the above events happen to you, feel free to vent by telling the universe TAC.