What do you eat to gain pounds on your behind or butt?

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Ok i had a normal size butt then all of a sudden out of no where my *** was gone .....lol i didn't even know what hapened i think it was the medicine i was taking or something but yea some people told me you could gain pounds on your bottom by eating specific food but i forgot what they said. Anybody known of any food that could do that or gain pounds on myself fast ... i also got skinnyer then i already was. ::depressed =[