Verb; The act of flipping your coat over your head while making a sad face like a pouty little bitch. Made famous by quarterback Phillip Rivers, think of it as his version of tebowing!
Did you see Earl? He's in the corner Rivering cause I've been smashing him all day in Madden!
Also a term which refers to shedding an incredible amount of tears capable of making a river. It is usually used when telling others about extremely sad things.
"Hey, did you read that Thorki fanfic I told you about?"
"Yes, and the feels were too much. I was rivering so hard, my poor babies."