Trouser trout vulgar noun slang
Use to imply a man's sexual organ or a penis
I was really embarrassed when I saw his trouser trout.
The origin of this expression is not clear.
If you swallow the bait, you take something that someone offers you, or agree to do something that someone asks you to do without knowing that it is a trick or way of getting something from you.
You can't just do whatever he wants you to do. Don't swallow the bait.