Pejorative term first coined by Frank Zappa, used to describe long, boring, wanky guitar solos. Onomotopoeically derived from the three note patterns commonly played by 'virtuoso' guitar soloists.
"Fuck Satriani, all he does is go deedly deedly dee all day. If I wanted to listen to someone jerk off, I would do it myself."
by Danny Delinquent December 22, 2003