put lead in one's pencil
American Heritage Dictionary of Idioms:
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put lead in one's pencil
Enhance or restore sexual vigor, as in Try one of these hot peppers; that'll put lead in your pencil. This phrase, a euphemism for causing an erection, is considered far more vulgar than the contemporary synonym
put hair on one's chest, alluding to a secondary male sex characteristic. [Colloquial; c. 1900]
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American Heritage Dictionary of Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.
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