IIRC is an internet slang initialism that stands for "if I remember correctly" or "if I recall correctly". It is used in text messages, emails, social media, and other forms of digital communication to express uncertainty, add politeness, or correct someone in a sarcastic way. People use IIRC when they are not entirely sure if something they are saying is true, or to qualify a statement with uncertainty. It is also possible to use IIRC to correct someone in a sarcastic way. For example, "The rainy season, IIRC, begins in January", or "IIRC, you left your keys on the couch again".