Usually Brock is a male name, usually a white male.
To Brock something is very different. This is in the case when one gets too drunk to hang, so they disappear without notice, most of the time to go fall asleep in said one's bed. You can also use it when one disappears from a bar or club (or anywhere) without announcing their destination, usually in this case it is because the "Brock" has no idea themselves.
"Where did Ryan go?"
"Oh, he pulled a Brock, I have no idea... maybe he's sleeping under that car again."