Large groups of individuals that hang out together on weekday (Workday) nights at late hours. They can either be a group of friends in a strange place on weekday evenings or several driving together in a planned pattern maybe themselves seem "Professional"
Person 1 - "Hey look at all those people, why are they out here on a wednesday night?"

Person 2 - "They are professional friends, that's why!"
by Tigrez May 28, 2009
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Someone who doesn't want any of the commitments of friendship but wants to reap all the rewards that come with having that or those friends. They're never there when you need them but never have a problem asking you for things or help. They're in the "friendship" for all the wrong reasons.
"Have you ever noticed how none of their friends remain friends for very long? Like they may know a lot of people and talk to a lot of people but they never hang out anymore?"
Only professional friend hoppers jump from group to group or person to person like that.
by RealistaHermana August 5, 2018
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