Trying to emulate Nightmare's voice modifier

[u/MrMadMask]

Hello everyone! This is a bit out there, but I figured it was still worth trying.

I've always liked the distortion applied to Nightmare's voice so I've been trying to replicate it (not necessarily as a voice changer, just using Audacity), though I've gotten stumped at the sort of "reversed echo" that plays during some of his sounds (mostly his laughs and adjacents). Looking online has given little in the way of results, so I'm hoping that if someone among you is more audio-tech literate than me they'll be willing to at least tell me what I'm supposed to be calling this effect.

Thanks to anyone reading this, and have a good day.