"Crating" is where someone argues or belittles your opinion so hard, even when solid evidence proves them wrong, that they put themselves into a "crate" (which is usually stored in a warehouse). The "crate" keeps them from seeing the truth, or tries to hide their "goods" (insecurities or mistakes) about anyone with a different viewpoint who is obviously right.
"I was telling Melissa the other day about all the data supporting global warming, and she kept "crating" on it. She, like, wouldn't even look at the facts and just kept denying. I think she was scared."
"When Tyson kept doggin' me about beating him in the game, I just said to him "Don't be hatin', unless you're cratin'. That shut him up quick."
the act of bringing a crate into a colege dorm shower to sit on while masterbating.
John: "hey Rudy, what are you doing with that crate?"
Rudy: "I've been pretty frustrated lately, so im going crating. Now get outa that shower, i need to use it."