An old person,and/or someone who is not fun. A kill joy, elder; Fun Hater
While we were car scaping, I looked to the left of me in order to sing an obnoxious song off the radio to another passenger, who was placed in another automobile. The balding patches and discontent look gave me the notion, he was indeed a yamp.
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."