DWMB 

1: double dumb

Gangnyam style is dwmb

DWMB by Moon Baby October 9, 2012

dwmbo 

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!)

dwmbo by jammyjames60 June 3, 2004