If you’re working on Tillers rep, then there will be a time you need Raw Crab Meat. Now, the conventional wisdom of WoWhead is that it drops best from Rockshell Snapclaw, hermit-crab-like humanoids found underwater on a shelf southwest of Soggy’s Bottom.
It’s underwater. If you don’t have a potion you have to surface to breathe from time to time. If you’ve already done a certain quest in the zone, you get your Sea Legs buff, but if you haven’t, you don’t. A bit of a pain, really.
Just northwest of there is another spot, The Briny Muck, in which turtles, crabs, some Sauroks, and some big elementals hang out. The crabs are of interest, as they have almost as high a drop rate as the previously mentioned Snapclaws, plus there’s a spot you can go to that has a nearly constant supply of them.
In one direction is a crab that spawns pretty much as fast as you kill it. Turn around 180 degrees, and there’s another one that does the same thing. So it’s kill, turn, kill, turn, loot, kill, turn etc.
One of the Sauroks will occasionally aggro on you, and there’s one group that will avoid you as long as you don’t pull them, but aside from that, it’s all gravy.
Here’s a couple of screen grabs to help you situate yourself, complete with piles of bodies to illustrate the incredible spawn rate.