Flirting Day, called फ्लर्टिंग डे in Hindi, is observed on February 18 as the fourth day of the informal "Anti-Valentine Week" that follows Valentine's Day. Like the rest of the sequence, it has no documented historical origin — it's a pop-culture tradition that spread through greeting cards and, later, social media.

It's treated as a light-hearted occasion for playful romantic banter and flirtatious messages, aimed particularly at singles, in contrast to the more committed, sentimental tone of the earlier Valentine's Week days.

Mostly through humor and social sharing — playful lines, teasing messages, and posts such as Flirting Day Shayari or a cheeky Flirting Day Status update. It remains most popular in India and South Asia, where the full Valentine's/Anti-Valentine week sequence is widely recognized informally.