To be model trains for someone means to be happy about their situation. It is the opposite of being jealous or envious. If someone does better than you in a competition or such, you could feel jealous of their result, to instead be happy for them regardles of your own result would be to be model trains for them.
Wow, your house is so nice, I am model trains for you.
I wish I could travel too, but I'm model trains about your upcoming trip.
Someone or something that bites your ankles.
To a postman, an ankle biter is often known as a dog.
To an adult, an ankle biter may be a toddler.
To hikers, an ankle biter is sometimes a tick.
And so on.
When a man will search for hours to find something that is laying out in the open on a table. Items are often easily found by a women.
Man: "I have been searching for hours for keys."
Woman: "You mean the ones sitting there on the coffee table?"
Man: "Where?"
Woman: "Right there in the middle of that table."
Man: "oh, must have been Male Pattern Blindness"