fettying. Fet-tee-ying A word drug addicts use to describe the weird and excited feeling that takes hold when one has acquired his or her drugs, and is getting the logistics together to do them. ex. “We copped some tar from Charlie over in Venice, fuck dude, I was fettying so hard till I got in the Denny’s bathroom and spiked that shit.” The name of a rapper, Fetty Wap. When your drunk uncle tells you to clean up that fetty mess after the piñata party has ended.