Definition
An unexpected third party who inserts themselves into a couple's intimate moment at a club or party—basically an uninvited participant in what you thought was a private flirtation. It's the physical manifestation of boundary-crossing.
Example Usage
We were just dancing together when a fifth hand came out of nowhere and ruined the whole vibe.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=fifth%20hand&defid=1421831)
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