Spin - One play of a song. For example, the sentence "Kiss 108 spun Rude 120 times this week" just means that they played it 120 times this week. On the airplay charts, songs are sorted by the amount of spins they have received from a particular format in the last 7 days.
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Bullet - The change in spins from 1 week ago to today. For example, if a song has 8,000 spins one week ago and 8,750 today, its bullet would be +750 (often written simply as 750). If instead it had 7,750 spins today, its bullet would be -250.
We touched on this in the last podcast Calvin, Zedd, and other DJs/EDM producers are losing their foothold in the mainstream a bit. Calvin hasn't had any momentum since Summer, which just happened to be his last song to sell (relatively) well.
Well, we saw it coming for Zedd, both IWYTK and BN were meh and boring tbh