have lead in one's pencil
have lead in (one's) pencil
vulgar slang To be able to have an erection. You'll have lead in your pencil, guaranteed, after following this six-step program. I was so drunk that I didn't have lead in my pencil, if you know what I mean.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
have lead in one’s pencil
1. tv. to be vigorous and active. (Widely known phrase. Not taboo.) Your problem, Tom, is that you should have more lead in your pencil. You just don’t have the stamina.
2. tv. to have an erection of the penis. (Usually objectionable.) Due to his drinking habits, he never has any lead in his pencil.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.