"Who's a widdle gunny wunny!!!" is a red text modifier on weapons in Borderlands 2
Found on the following red text weapon: Hefty Baby Maker (or any other Babymaker Submachine Guns), which you can get off Madame Von Bartlesby in Tundra Express
Grants Weapon Effects[edit]
The grenade effect when reloading, explodes in a MIRV like fashion splitting into several tiny grenades.