The Mega Supa Ultra Killa Megaturret, also known as the Mega Supa Ultra Killa Megaturreta, Mega Supa Ultra Killa Runa Outta Stuffa Toa Saya Meg-a-gain turret and often shortened to simply the Megaturret, was the ultimate weapon. It had more power than all of the other weapons, but the RYNOCIRATOR was considered a more powerful weapon as you had to shout whenever you wanted to say its name. Ratchet bought the Mega Supa Ultra Killa Megaturret on Cerebella for a few thousand bolts.

Ratchet & Clank wiki
For those without comedic tastes, the so-called experts at the Ratchet & Clank wiki have an article about Megaturret Glove.