I thought the term "pego" was a vulgarity.
I first became aware of the word from reading it in chapter 1 page 3 of Alan Moore's and Eddie Campbell's Jack the Ripper story "From Hell." The panel in question is scanned and can be viewed below (probably not safe for work):
The Urban Dictionary defines the word as
Male ego as channeled through the penis.
I used "Pego" as the name of the doctor from my short film "Zany Dick!" (which is definitely not safe for work):
And now Sony has used the word as part of the name of their handheld video gaming system. Nice. The male ego as channeled through the penis strikes again!
PSPGo and hand pic source.