Having a "signature" saying, sound, or word in certain productions/songs is nothing new. Although... however, Beluga Heights could've concentrated on making their pronunciation and saying a bit more audibly understandable. Have you ever typed in "Deluka Heights" and various versions of what people could mistake it as in google only for google to already somewhat know what it is you were looking for - because many other people were also trying to figure out the same thing? Not sure how much it helps to have a nearly non understandable name thrown into a song, but then again, maybe it's not understanding what they are saying that is really important, but just knowing that when you hear it, you know it's the same producer that produced "that other song" you heard. In the end, if you / people begin to realize "I seem to like every song with that signature / saying in it", that's all that really matters - you recognized and realized you tend to like things with their trademark. Besides, I guess it kinda worked because not only are people talking about it, but it even became a topic of this board!
I'll take "Beluga Heights" over "DJ CLUE!" or some other things I've heard over a record, numerous times throughout a song! However, I'd say Timbaland is pretty much my fav when it comes to his signature ways because he leaves his signature mark in his music in creative ways, especially more so in his late 90's productions. I think Missy's "REMIX!!!" signature on her remixes that seemed to catch on in the mid 00's was pretty good, too. That was different... until everyone else started using it and people started making drops that yelled "reeeemmiixxxxx!!". Lil Jon has his unique signature style, and so does LMFAO's Party Rock productions.