if someone has a one-track mind, they seem to talk and think about one particular subject all the time, especially sex.

'I bet I know what you two were doing last night.' 'Oh, shut up, Sean, you've got a one-track mind.'

You've got to have a one-track mind if you want to succeed in business.

• you better believe it
• You bet your ass!
• you bet your ass
• you bet your bottom dollar
• you bet your sweet ass
• You bet your sweet ass!
• you can bet on it
• you can bet your bottom dollar
• you can bet your life
• you can kiss goodbye
• you can kiss something goodbye
• You can lead a horse to water.
• You can lead a horse to water but you can't make him drink.
• You can lead a horse to water but you can't make it drink.
• you can say that again
• You can say that again!
• You can talk!
• You can't judge a book by its cover.
• You can't keep a good man down.
• You can't keep a good woman down.
• You can't make an omelette without breaking eggs.
• You can't make a silk purse out of a sow's ear.
• You can't make bricks without straw.
• you can't miss it
• You can't say fairer than that.