The combination of trix (trick) and trap, both basically meaning the same thing, but if you want to be 100% sure your saying the right one use trax.
Trap - If a picture of a girl is displayed or posted somewhere and you notice that she has an adam's apple. Perfect example of a trap.
Trick - If you think your talking to a girl on the internet only to find out they say something that makes you realize they are a guy.
Guy: So what do you like to do for fun?
Girl (Actually a guy): Play with my penis. =]
Guy: FUCKING TRIX
There you have it, trax.