Where two or more buddies get into adjacent stalls and see who can take the loudest shit.
"Did anyone else just hear a truck backfire?"
"No, thats just John and Mike playing battleshits."
When your moving so fast your peripheral vision becomes extremely blurry and you can only see straight ahead.
"I got to ride in a Z06 yesterday"
"Was it fun?"
"Yeah but after 160mph I started to get tunnel vision"