Hefty Baby Maker Sub-machine Gun. The red text effect says "Who's a widdle gunny wunny!!!" SMG Red Text

"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

The grenade effect when reloading, explodes in a MIRV like fashion splitting into several tiny grenades.