What we're addressing now are all the pathetic things grapplers say to their teammates/opponents after getting dominated on the mat. If you've trained for more than a bit, you know exactly what I'm talking about. It's not a good thing to do, but, the truth is, we all do this in one form or another at one time or another. BJJ is a form of competition and it's human nature to be embarrassed when you perform poorly (even though you shouldn't). And, sometimes, yeah, you make a stupid excuse to dismiss a submission someone got on you. It's OK, grappler. We forgive you.
At the same time, it's really fun to mock "that guy" (could be you) for all the stupid things he says on the mat and in the "locker room" (we don't have any lockers at our academy; just 2 benches and a lot of smelly dudes). Check out two great animated shorts created by Michael Jen (using Xtranormal). Michael knows of what he speaks - he's a 3rd degree black belt under Joe Moreiera and head instructor at Smash Gyms in Milpitas, CA.
So, try not to be this guy, even though, at some point, you will be (I guarantee it).