frolleague
Friends + colleagues - for when your love and respect for your co-workers is both immense and totally work-appropriate; with a frolleague crowd, you typically switch between being fun and relaxed, and professional depending on the context.
At work: "I have a meeting until 5, but afterwards would love to spend time with frolleagues at happy hour."

At a weekend BBQ: "Solid beer choice from the new frolleague. Why aren't you this cool at the office?"