A euphemism for the ability to give a fantastic blowjob. Most often used by johnlock shippers.
"I wonder if John can keep up with Sherlock in bed."
"Don't be an idiot, he learned the clarinet in school."
by J.H.W. November 4, 2012
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Euphemism for "I give a fantastic blowjob".
In BBC's TV miniseries Sherlock, John Watson, (boyfriend to Sherlock Holmes) is discussing his various talents which include physical and mental flexiblilty, parenthetically adding at the very end of a long list "I learned the clarinet at school."
by dappertophatter November 4, 2012
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V. Euphemistic, means "giving a fantastic blowjob" among the more subtle circles of sex-driven musicality. Frequently whispered by lusty musicians both in and out of educational environments.
"Man that was some fine clarinet lernin' going on at school today," said J.W. as he wiped the cum from his lips.

"I certainly learned the clarinet at school well today."
by Mycroft H. November 4, 2012
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Slang for 'able to give a fucking fantastic blowjob'.
"Let's just say she learned the clarinet at school," John replied, as his mates crowed loudly and patted him on the back.
by Ferretsoup November 4, 2012
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An innuendo alluding to the speaker's blowjob skills.
'I learned the clarinet at school.'
'I look forward to it.'

'Have sex with me.'
'Why should I?'
'Come on, I learned the clarinet at school.'
'COMING!'
by Johnlock November 4, 2012
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