You can add a file to tempdb if you need to. Or explicitly expand an existing file(s) yourself.
Be extremely careful if/when trying to modify, or drop, existing objects in tempdb. It's very difficult to quickly accurately determine which ones are in use or not.
SQL DBA,SQL Server MVP(07, 08, 09) "It's a dog-eat-dog world, and I'm wearing Milk-Bone underwear." "Norm", on "Cheers". Also from "Cheers", from "Carla": "You need to know 3 things about Tortelli men: Tortelli men draw women like flies; Tortelli men treat women like flies; Tortelli men's brains are in their flies".