STS

STS is an Internet slang term/abbreviation used to mean “smirk to self.” It is used to convey a sense of self-satisfaction or smugness. It is often used in online conversations and social media to indicate that someone finds something amusing or is feeling pleased with themselves.

Examples:

1. I finally finished my project ahead of schedule STS.

Explanation: Here, the person is expressing their satisfaction or feeling of accomplishment after successfully completing a project before the expected deadline.

2. Just won another game with a perfect score STS.

Explanation: In this example, the individual is indicating their smugness or self-satisfaction after winning a game with a flawless performance.