To shout at someone unnecessarily.
Shouting at someone unintentionally, as if your internal "caps lock" was accidentally struck.
"Dude, I'm right in front of you...stop cap-locking me!"
"Did you see Brad cap-locking that waitress for no reason?...what a jerk!"
"That Slipknot concert has jacked up my hearing, bro...I've been cap-locking people all day without knowing it...I feel like a pint-sized Lou Ferrigno."