THUMP is a roleplaying verb.
A vein in your forehead starts pulsing. You notice a vein pulsing in XXX's forehead.
You rub your eyes. XXX rubs her eyes.
You thump XXX. XXX thumps you
Behind the Scenes
In the past, thump was used as a deterrent for bad behavior. A character of sufficiently higher level than an offending character could use thump to incapacitate. This functionality has since been removed.
XXX thumps you! The blow catches you square in the solar plexus! You double over, gasping for air.