The ship that was claimed by engineers to be the Unsinkable until a mere iceberg turned that fucker into one of the mostembarassing failures of he 20th century.
Originally the name of an Olympic class ocean liner built and launched in 1912 (And sinking in the same year on it's maiden voyage) Titanic usually refers to when a situation is degrading rapidly with the girl you're chatting up and your chances of "getting in" are dropping fast.
A Titanic situation can be avoided with proper preparation of resources such as deodorant and in some cases, basic knowledge of the individual.
Guy one to his mate guy two: "Shit that was horrible, that went down faster than the titanic" Two: "What happened? Did you let her go jack?"
When two men interact in a sexual manner. Specifically, one man stands in front of the other. His intimate companion stands behind, penis inserted inside the other's anus, one arm around his lover's chest and his other hand holding the other's manhood. The man in front stands with his arms spread wide, akin to Rose from Titanic. This move may be accompanied by a well known Celine Dion track, although this is optional.