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1.
1) Traditional Japanese wooden flute.

2) Blowjob.
1) He is an excellent shakuhachi player.

2) Mr. A: I think he plays the shakuhachi.
Mr. B: Maybe so, but that's your wife's job.

She did shakuhachi on him.
by cjarian September 23, 2005
 
2.
1. The shakuhachi (しゃくはち) is a Japanese flute made out of a hollow length of, most frequently, bamboo, with five holes for fingering, creating musical notes based on the pentonic scale.

But the lovely, haunting sound produced by a master player of the the instrument is caused by blowing across a chamfered cut at the mouthpiece, called a fipple. Many beautiful tones may be coaxed out of such a flute, but extraordinary skill in use of the lips and tongue is necessary, as well as relaxation of of the throat muscles to widen the air passage is necessary.

It may be because of this great skill in applying lips and tongue to the mouthpiece, as well as the ability to widen the air column in the throat, that the second, slang, use of the word has come about.

2. "shakuhachi" (しゃくはち) is slang term in Japanese for fellatio.
"I just heard the band Autumn Tears play 'At a Distance' from their Eclipse album, using a shakuhachi Japanese flute. It was hauntingly beautiful."

"If it was as beautiful as you say, then I'll bet that some of the groupies in the audience showed their appreciation by giving the band shakuhachis after the show."

"But if the concert was over and they already played it, why would they need a groupie to give them another one afterwards?"

"Just skip it
by Dr Whosis December 13, 2010