Informal. thank God it's Friday.
Also, T.G.I.F.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

by 1970, slang abbreviation of "Thank God, it's Friday" (end of the work week).
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

TGIF definition

  1. interj.
    Thank God it's Friday. (Initialism.) : Everybody was muttering TGIF by Friday afternoon.
  2. n.
    a party held on Friday in honor of the end of the workweek. : Everyone is invited to the TGIF tonight.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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American Heritage
Abbreviations & Acronyms
thank God it's Friday
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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