Place it at the end of a back-and-forth, right after the other person makes their final claim, then follow it with Oh My God Wow for a bigger reaction. For a longer argument, open with No No Wait Wait before the claim so the acceptance closes the debate.
Sobre este som
This is a short spoken line, lasting just under a second, in which a voice says 'Okay I believe you' in a flat, giving-in tone. It sounds like someone dropping an argument rather than winning one, which makes it funny in a dry, resigned way. The brief delivery leaves the doubt hanging, so the listener hears surrender mixed with a hint of sarcasm.