When you say the beat of a certain song is ''hot'', it means the beat or the melody is catchy and pleasant to hear. It's addictive or makes you want to dance, not that it's necessarily the best song of the year, but you want to dance to that beat; you're humming the beat; you're feeling it.
I just played on <<Heaven Can Wait>> by Michael Jackson, and as it started, I thought: ''Damn, the beat is hot!''.
by @yoururbandictionary November 12, 2022