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to ''yam'' something is to do it, so yamdat means do it. it came from some friends and i talking like idiots and coming up with it. now it has spread....oh dear

it can also mean to hit, damage, finish or destroy something... well anything really that you would do with enthusiasm.

''i just yammed that defenition! bla bla!''
yeh i yamdat daily bruv!
by Not Normal April 20, 2011
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