This Easter Egg is very funny and you will get it if you know what Moxxi Means,
Also get an Achievement for this
RequireMents[color=Font Color] [/color]
1.You will need to be at the Moxxi bar or gambling place in sanctuary just past the black market
2.A decent amount of money "$200,000"
Tuturial [color=Font Color] [/color]
1)Goto Sancturary
2)Then Walk to the Moxxi bar past the Blackmarket
3)Lady Moxxi will be standing behind the bar
4)In front of her will be a Tipping Jar
5)Tip as much money until she says "Oh here is my most Favourite Weapon"
6)Easter egg is when you have the gun equipped it vibrates your controller and Moxxi used it as her u know D*LDO+ the vibration hahahha funny Easter egg

Rep if you want and thanks for reading