To be so passionate in one's musical conducting as to raise and hold both arms in the air whilst clenching all ten fingers with much vigor, usually during a prolonged fermata. Named for the legendary Dr. Peter Boonshaft.
Dude, it's only the end of the second movement and he's already boonshafted it twice!
by mousekopf August 21, 2006
1 more definition
Amanda was getting some of that boonshaft last night.
by hollabek October 29, 2007