trousers that are so short it is unbelievable that anyone would wear them. generally you can see a couple of inches of ankle/the top of a full length sock if they are knee bashers, if not they are ankle bashers.
by JFwolves July 13, 2012

Him: Hey Check out my huge knee knocker
*Pulls down pants*
Her: Oh my its so big
knee knocker is a large erect Penis that is above 8 inches
*Pulls down pants*
Her: Oh my its so big
knee knocker is a large erect Penis that is above 8 inches
by YT- Landonb December 22, 2018

by jeffrulez March 22, 2010

by Michael Michael Motorcycle August 21, 2013

by allixue21323 January 12, 2011

by I, Wreckerrr October 13, 2016
