To offer a blowjob where the reciever stands, and the giver performs from their knees. Because of ethical issues the roles are often reversed where the blowed becomes the blower resulting in 2 seperate cases of brit knee. Often relates to cases of men performing oral sex on each other.
There was five minutes between meetings that afternoon so during the break Tim gave Jim some british knee. On tommorrows break Jim hopes to return the favor.
by Jason Buckley October 13, 2007