Forum:"Impenetrable Wee Wee's Super Booster"?

Hi, I just got the PS3 version of Borderlands:GOTY (DLC on disc) a few days ago. (PSN is Kowalski-17). I started playing it for the first time last night, and played it a ton today. I did single player for a while (until level 21, I think.), then started playing coop. Eventually, I hosted my own game, and did that for several hours. On Trash Coast, right past the deck with the vending machines on it, my coop partner pointed out a shield on the ground. He might have dropped it or an enemy might have, I don't know. This was the shield:

Purple Text: "Impenetrable Wee Wee's Super Booster"

Brand is Pangolin.

Capacity: 214748

Recharge Delay: 6

Note says..."Overcharge Capacity!"

Value is "$9999999."

The shield is equippable and ir works. And the actual # for the shields in bottom corner is 2147483647. Is this a legit item? If it was a mod/cheat, how come it happened when I was hosting the game? I did kill Wee Wee with the character earlier when I wasn't hosting. Thanks for the help!