Yes!
that is all.

I've been looking for a source myself

All I know is that it happened

Don't know which novels/short stories

But it's like the only references to Gork and Mork interacting with the entirety of the Warp we have

Ok, fair enough.

Gork and Mork are like Gun totting Ying and Mace Wielding Yang

Speaking of the great green gods. Anyone hoping to be able to cast Foot of Gork with Oddboyz?

I know the lexican talks about how Gork'n'Mork kick the ass of Nurgle and Khorn, Sources should be there.

I actually took a look there before I asked for a source. Neither the lexicanum nor the warhammer40k wiki spoke of this event on the Gork n Mork page.

The Gork and Mork page is pitifully underwritten

There's not much to go off of from the lexicanum