Ummm... Frankenhooker... I have questions lol

Okay, so I just watched Frankenhooker, and I'm...confused, but also kinda obsessed? Like, it's SO bad, it's good, you know? Jeffery Combs is amazing as always, even though he's playing the most ridiculous dude ever. I mean, the lawnmower scene?! Seriously, a lawnmower? And then he's just like, "Okay, gotta rebuild my fiancee!" I was dying. But here's my main thing - those supercharged crack rocks? LOL. Were they actually supposed to be funny, or was that just a happy accident? Because when those hookers started blowing up after smoking them, I literally choked on my popcorn. And then they're all like, SUPER robotic, shouting "Want some high voltage?!" I kinda lost it. Also, is there ANY explanation for why he could only save her HEAD? Like, did I miss something? I feel like even in a movie this insane, there should be some sort of (bad) science-y explanation. Or is it all just pure, unadulterated 90s B-movie madness? I need to know if anyone else found it as hilarious-yet-disturbing as I did, and if anyone has any theories about the exploding hookers. Like, was that supposed to be a commentary on something, or just pure exploitation? I'm genuinely curious!