"god DAMN that's a good hole" - I've gotten that numerous times, and it's almost always in conjunction with the way I use my hole to milk a guy's cock. I don't really have anything to explain it or compare it to, just that I've listened to guys (literally and figuratively, listened to their bodies) over the years to hone my ability to focus my muscles, level of "grip" and pressure, ability to undulate/squeeze-relax, and most especially my timing, that's probably the key. I'm usually able to sense the right moment (more or less) to engage my core and hole so that the guy fucking me starts to feel the effect right at the moment he's about to cum, and I continue to do it the whole time his cum is pumping out of his cock until a few moments after he's finished unloading.
It always puts a big smile on my face and makes me feel fantastic whenever a guy tells me that, and I can tell it's meant sincerely. I can usually hear and feel it sincerely lol - when I do it I have a knack for making guys shoot extra hard and experience a super intense orgasm, so it's pretty evident how satisfying a release it is for them even when I can't necessarily feel their cocks pulsing in me (though that is the best). Whenever I get the "good hole" compliment it also usually means I've got another regular fuckbud if I want that. I've got a few who get legit exited when I'm available because it means they're not just going to get to use a tight hot hole to unload, but that I'm going to seriously milk the cum out of their cocks and make it extra satisfying for them.