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3.
What you get when your homies are stingy with the bag.

Hitter: "Yo, lay me out a phatty."

Pitcher: "Nah man, I'm just doing key bumps."
by shimmy shimmy coco pop August 21, 2007
 
1.
The act of using a key to snort a drug. The drug is spooned onto the key and the placed near the nostril for inhalation.
"Hey, Lohan is inviting us to go do a key bump with her in the john."
by Revanche June 20, 2006
 
2.
The act of using a key to snort a drug. The drug is spooned onto the key and the placed near the nostril for inhalation.
"Let's go keybump in the bathroom."
by Fred Chang April 07, 2006