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1. (noun) Yet another slang word for booty. Only booties of immense size deserve this title. The root word of valumper is LUMP, which is referring to the lumps of the individual booty cheeks.
2. Can also be used in verb form, "to valump"
Person 1: Whoa that guy has an ass to win millions
Person 2: Yup, It's quite the valumper
by MoldyVoldy February 04, 2015
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