Yamp is a Southwest Philly coined acronym which means: Y.A.M.P. or to "Yield All Material Possessions". This term can pertain to haven items stolen from you or can be used in a scenario of a robbery.
"My man cross the street ain't paying attention. Cats 3 steps behind him bout' to Yamp that kid."
The affixing of "ed" to the term would signify a past tense situation.
"Yo he was out the crib for only fifteen minutes. Heads came in there and Yamped his whole stash, chief."
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