"An SEC designation applying to any individual who buys and sells a particular security in the same trading day at least four times in a five-day period, and for whom same-day trades make up at least 6% of the trader's activity during that period. Pattern day traders are subject to special rules. "
You need at least 25k in your account to get around this....so since your flagged, i assume its basically like a margin call for 25k