The funding rate, put simply, is the "toll fee" that long and short traders pay each other.
$BTW is currently longs paying: 0.0255%, annualized about 55.9%.
If longs are willing to pay such a high fee and still hold long positions, it suggests that the bullish crowd is crowded; in such times, the "smart money" often charges the funding rate.
Have you ever been wickedly jabbed with a sudden wick/stab (a "needle")?

Not financial advice. Do your own research.