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1.
Taking good dank weed that's covered in crystals (trichs) and stripping them from the buds to make hash, reducing their potency.
Why does Medical MJ in Cali always appear keifed?
by Drugged Warrior November 03, 2010
 
2.
to put keif (the crystal-like substance found on marijuana buds) on you bong hit/bowl pack.
Kevin: Hey, John, do you want to put keif on your bong rip?

John: Na man, i just keifed like 10 minutes ago.
by OnTopallDay November 18, 2009