Definition: Suddenness, a term of art that describes how events occur out of nowhere, can be described as "the sudden and unexpected change of circumstances." The expression "I don't know if I'll ever see you again," is often used in informal conversations to describe the abrupt end of an argument or confrontation.

An edgy example sentence could be: "She suddenly broke up with me because I always forgot her birthday!" This slang expression can create a sense of tension and unpredictability when it's used in a humorous or unexpected manner.