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Person from the Black country which is in the west midlands, very close to birmingham. The Black country dialect is very unique. Yam yam derives from 'you am' e.g 'yam coming with me ay ya?'
A couple of drug smoking munch seeking yam yam's in a car:

"Yam gewin the wrung way! Where am yo gewin kid?"
"I ay at all!"
"Ye yam, yo day tek that last turnin ya saft get!"
"Oh arr, soz I day realise"
"yo'll atta gew back im starvin I cor wait no longer kid!"
by A drug smokin yam yam June 08, 2007
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A person from the Black Country area of the West Midlands of England. Yam-yams use a slight variation of English that is often incompehensible to non-locals (and even to their neighours from Birmingham, with whom they share many similariies in vocal accent) due to both the thick accent of the speaker and the frequent exchange of standard words in place of local terminology (the most obvious example being the substitition of the word "you" for "yam").
"I wish these yam-yams would bloody learn some English."
by kipstik.FiL November 08, 2004
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People from the Black Country, who talk in an indescribable manner. See yam yam. Not yam yams.
X: Yam owkay?
Y: Yerr, I'm good, tarr.
X: Watcha bin doing?
Y: Nuffing much. Ow bout yow?
X: We am such yamyams, int we?
by magap August 15, 2008
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I'm a yam yam and I'm proud!!

we aye (aren't) brummies!!

yam yams are people from the black country, which is a shithole, but west bromwch albion is in the black country so its the best place in the world!!
oh yeah, there are two other teams, wolves (scum of the earth dingles) and walsall.

the black country is close to birmingham, which is full of chavvy villa and blues fans (shit on the villa!!)
ariite cock, yome ok? aarr great.
by number 1 haggis by the way March 31, 2005
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A yam yam is a native of the black county that is so intensely brummy that it has likely stunted their mental growth and made them effectively disabled.
Yam Yam: are yam alright cock?

Normal functioning member of society: Yes thankyou, now please stop having sex with my water meter; you're dribbling on the cat.
by el capitan the dangerman July 28, 2012
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