What does it mean to cheat at poker?

A tale of angle-shooting and the meaning of rules

A while back, I found myself on the wrong end of a poker confrontation. I was facing a river bet from my opponent—that is, a bet on the last possible community card, with no further action to come—and my hand was, well, not great. Bottom pair on a scary-looking board, where a straight and a backdoor flush were both possible. My hand was a bluff-catcher—…