IIRC is an acronym that means If I remember correctly, which is used when someone is recounting a memory. It commonly appears before a statement when texting or chatting online.

IIRC is sometimes used as a disclaimer to tell the recipient "don't quote me on this," which means I'm not 100% sure but it's what I can recall. Unfortunately, people's memories don't always work well so be sure to fact-check someone who uses this acronym.