Tuumassa
Tuumassa is a term that can refer to several things, most commonly a Finnish given name or a colloquial term used in Finnish slang. As a given name, Tuomas is the Finnish form of Thomas, a masculine given name of Aramaic origin meaning "twin." It is a popular name in Finland and has a long history of usage. The name Tuomas is often associated with Saint Thomas the Apostle, one of Jesus' twelve apostles.
In Finnish slang, "tuumassa" can be used as an informal way to say "in thought" or "thinking."