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This image can be found on 9GAG and Facebook:

People who use a lot of swear words tend to be more honest and trustworthy, human behavioral studies suggest.

Profanity is defined by Merriam-Webster as "an offensive word" or "offensive language". It is also called bad language, strong language, coarse language, foul language, bad words, vulgar language, lewd language, swearing, cursing, cussing, or using expletives.

The claim seems pretty simple and straight-forward, but I couldn't find any studies verifying the validity of 9GAG's claim.

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    I'm not sure that links to 9gag and a Facebook reposting of that 9gag link count as establishing notability.
    – Reinstate Monica -- notmaynard
    Commented Mar 26, 2015 at 21:19
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    Both of your claims are from 9GAG. Not saying that isn't enough, but try and be more diverse with your sources next time. Usually if only one place is claiming something it isn't true.
    – Cruril
    Commented Mar 27, 2015 at 17:52

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Doesn't look like it. The most likely source of the quote is The Science of Swearing by Timothy Jay and Kristin Janschewitz or possibly Dr. Neel Burton's Hell Yes: The 7 Best Reasons for Swearing or possibly the summation by Psych2Go which draws on both of them:

The basic premise that is put forth is that those who cuss are seen as more loyal, trustworthy, and upfront. As such, those who swear may make better friends. Their work suggests that extroverted people and those with Type A personalities swear more (Jay & Janschewitz, 2012), which could be one contributing factor to why those who swear are seen as more trustworthy and loyal. Their research also suggests that the increase in swearing in general, and specifically the use of cussing as a way to speak with friends, may contribute to this image (Burton, 2012).

However:

Unfortunately, after searching for additional research on the subject, no corroborating studies could be found that can validate this claim. Additionally, Jay and Janschewitz have drawn these conclusions about swearing through observation. The major limitation to observation is that, when it is not scientifically validated, it is simply that – an observation.

The Bad Psychology blog has weighed in, saying:

The short answer is: This fact was probably made up.

A 15 minute Google search yielded many hits, but as always (and you'll start seeing this as a pattern with such "facts") none of the websites included legitimate sources. They all claim that studies or psychologists say something…but they never—never—source their claim. And when they do included [sic] "sources," they usually lead to pages where people are just speculating or spreading the same claim without primary sources.

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    Also, even if their conclusions are correct, there is a big difference between being seen as more trustworthy (what they report) and actually being more honest and trustworthy (which is the claim).
    – KSmarts
    Commented Mar 27, 2015 at 19:29

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