The phrase "guest stint" means a temporary appearance or performance by someone who is not a regular member or part of a group or organization. Full definition
Her other early roles included a 2004 guest stint on the futuristic CBS drama «Century City,» starring future Oscar winner Viola Davis, and a 2005 role on the Shannon Elizabeth UPN comedy «Cuts.» (chicagotribune.com)
Fox's guest stint didn't just reinforce how much the show has evolved past its initial premise — if anything, losing Jess made the show better than it had been in years. (theatlantic.com)
Zachary Quinto has a fun guest stint as the ultimate hipster asshole, but it's Adam Driver and Alex Karpovsky who remain the show's greatest assets. (blog.bullz-eye.com)