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1.
Similar to the brofist, the broknee is a greeting used amoung friends and acquaintances. It may also be used as a celebratory gesture. A broknee is performed by bumping ones knee with that of another person.
He gave his bro a broknee to celebrate a good match of call of duty.
by Wordsaretheworld November 21, 2011
 
2.
In an attempt to rid the world of 'Bronies'. --> Bro-knee.

The act of approaching your bro sneakily, and smashing your knee into the back of his leg making him collapse.
Luke was just standing there, when Kieran appeared from nowhere with a super Bro-knee!
by br0kn33 January 02, 2014