put lead in one's pencil(redirected from put hair on one's chest)
put lead in (one's) pencil
Of a man, to increase, enhance, or restore one's sexual ability or vigor. Following this six-step program will put lead in your pencil, guaranteed. The only real way to put lead in your pencil is to eat well, exercise regularly, and have self-confidence.
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]