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2.
Synonym for "dumb ho", spoken with a cockney accent.
Look at that dumb oat getting fucked in the bushes.
by 122333444455555 November 03, 2007
 
1.
When in a crowd you are surrounded by idiots.
Tim: these people are just stupid

Wyatt: Dumboat!
by THezebra@!124 May 16, 2010