Thedoccal
Try making multiple copies of it...say 6.  Then do just a few things to each one.  Then mix them together.  Automate each one with pan and volume.

This is more or less how I do it. Distortion, eq, delays, reverbs etc.

You mean something like this?
 

Cool song, Craig! Not heard that one before

I really f*** up vocals any time I get in front of a mic.
 
If that's what you need...I can be had for a price.

Any of the various granulaizers - I just got Siren's.
SFX Machine's stuff.  Frostbite is good, too.
 
@

Don't overlook this just because it came with the Braintree release way back in February 2015...
 

 
Distortion, Cylon, and Megaphone can do some serious damage.

sethmopod
 The only thing that I'm sure of is that I want something really screwed up sounding.  What do you do when you need something like that?  Is there a synth that you can run it through with various filters?  I'm open to any suggestions!

A Granular effects VST would do it....  Melda productions MMultiBandGranular comes to mind.

https://www.meldaproduction.com/MMultiBandGranular

dantarbill
I really f*** up vocals any time I get in front of a mic.
 
If that's what you need...I can be had for a price.

lol!!  hired !!
 
I've used Dimpro before for something mad. Zeta too. Pretty much any synth will do it I guess. I like the idea above of doing half a dozen tracks and mixing it up/down to a aux track. That could be wicked.

I think Vocal Synth from iZotope is one of the best:
https://www.izotope.com/en/products/create-and-design/vocalsynth.html
 
 

Don't be afraid to put a vocal through an amp sim to really grunge it up. I use Guitar Rig for this, not only because of the amps but also because there are some very cool effects chains in it too. A sound I like is to put a vocal through an amp sim with a crunchy sound, then use a harmonizer (there's one in GR) to add a harmony a fifth higher (7 semitones). And then put it through a flanger lol.