trap model

A model (typically for fetish films or pics) who plays the role of a female, or male, but is actually the opposite gender, IE: a "female" trap model is actually just a femboy in drag, same with a "male" model.
Synonym for trap when used as an adjective for a person.

Degenerate 1: OMG Sammantha's feet are so FUCKING hot!
The Enlightened: Uh... I think that's a guy.... he must be a trap model.
Degenerate 2: Don't care.

model trains

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.