Actually yost on twitter was sure the Stars had been using it earlier than the Sens. In an attempt to prove him wrong I did a search for #peskystars and ...
it was first used by a stars player on twitter well before any sens players.
Like a year and a half earlier.
Here's one tweet from Steve Ott:
Steve Ott ✔ @otterN9NE
@DallasStars @fistric28 why he joined
http://twitvid.com/ALRGO ” HAHA.I guess they miss my attention in the dressing room. #PeskyStars
9:38 PM - 07 Nov 11
I don't think thats the earliest use of it but its the first time he used it.