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a welsh slang word merging the words "dwi ddim yn gwybod" (i don't know) into one lazy outburst instead of using the actual language. Normally used by people from Caernarfon that have nothin better to do than sit around Safeway car park
"What Are You Doing Tonight?" (Be Wyt Ti'n Wneud Heddiw 'Ma?")

"Don't Know!" (Dwmbo!)
by jammyjames60 June 03, 2004
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