put lead in (your) pencil

British, humorous

to increase a man's sexual ability.

You should eat a few oysters - that'll put some lead in your pencil.

• cannon fodder
• can of worms
• can on ear
• can on their ear
• can talk the hind leg off a donkey
• can talk the hind legs off a donkey
• can talk the legs off an iron pot
• can't be arsed
• can't be bothered to
• can't be bothered to do something
• can't believe ears
• can't believe your ears
• can't boil an egg
• can't complain
• can't cut the mustard
• can't do something for nuts
• can't do something for toffee
• can't do something to save life
• can't do something to save your life
• can't for nuts
• can't for the life of me
• can't for toffee
• can't hear think
• can't hear yourself think
• can't help