Alright so to many this quick and easy

I have 600 songs on my Ipod touch
I have 550 in my Itunes library

I deleted 50 in my itunes library that I didn't like. But I didn't have my Ipod connected to delete the songs from that as well.
So it would take forever to remember the songs that I deleted, find them, and delete them.
Is there some quick way to auto-delete the ones that are on my ipod, but not my library?

Whenever i do that it syncs up quick as fuck, doesn't take long to remove songs, just to add them. From mine anyway.

From the way it sounds, as soon as you plug in your ipod it will auto-sync and delete the now-removed songs from your ipod.

I might have this confused with it working vice versa though.

Nah.
When it auto-syncs It just fills the songs I've added.
I have 630 songs on my ipod
And 595 in my itunes library. I wanna take those 35 songs off my Ipod

delete all songs on your ipod and re-add them. won't take more than 10 minutes really.

why didn't I think of that..damnit

If you just sync after you deleted it off your itunes it'll remove them from your ipod... a lot less than 10 mins, not sure if older versions do this but again, mine does, takes just a few seconds, don't see why you'd erase everything on your ipod