I didn't understand the first sentence (על ידי פתוי??). Where did you hear this sentence?
I didn't understand the second sentence too, but the word "מסריח" also means that something is unfair. So is it makes sense?
And about the last sentence - it is not a phrase but the meaning is that someone showed his happiness.
* An xample to the word "מסריח" as unfair:
עשית לנו תרגיל מסריח
** You can also say:
לעסקה הזאת יש ריח לא טוב
if you want to say that you think that this deal is unfair or a scam