There's no definitive answer to this question since it can vary depending on the game and server you're playing on. However, from what we gathered from various sources, it seems that dropping money in Project Slayers is possible in some cases. In other words, if you're lucky, you might be able to find a game where players are allowed to drop money as means of giving away their extra cash. However, do take note that this isn't always the case and there are servers which strictly prohibit money-dropping. So if you're planning on doing this, it would be best to ask around or check the rules first before attempting anything.