1. Slang term for a vulgar word because most of the most vulgar words are four letters long. All of George Carlin's Seven Dirty words are either four letters long, or contain a vulgar four letter word.

2. Any word, that while not vulgar, may have unpleasant connotations to the person referring to it as such.
1. Bob got fired from his job because he said a four letter word to a customer

2. Love is a four letter word
by Lord Butterknife December 20, 2008
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A set of words written with four letters that are considered obscene or vulgar unless written on the internet.
four-letter words in Real Life:
Kid - "shit..."
Dad - "What the Fuck did you say?"
On the Net:
Kid - "omg slut. damn what a fucking shit cunt"
Dad - "qft"
by Kirkface September 25, 2005
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(1) Yeah
(2) Uh
(3) What
(4) Haha
Sample from any Will Smith rap:

"uh.. uh... yeah yeah yeah yeah... what what... haha haha!"
by Baller-Ass Nigga March 1, 2005
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When non-mask-wearing in public has become a symbol of noncompliance, defiance, or rebellion among members of right-wing political parties or alt-right religious or conspiratorial groups.
Hardcore white racists and supremacists in the US and the West deny the protective health benefits of the mask against the coronavirus—for them, mask is a four-letter word, and donning a mask is a vain habit of the weaklings, who have surrendered their personal rights to the authority.
by MathPlus April 15, 2021
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FEAR of not understanding the new math concepts.

FRUSTRATION in struggling to make sense of the concepts.

FATIGUE from mental stress and emotional pain in grasping the concepts.

FAILURE in mastering and applying the concepts.
Winners have not only banned the four-letter F-word from their vocabulary when faced with the most disliked school subject, but they have also refused to let the four “F” words in math rent a space in their minds.
by MathPlus January 7, 2018
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