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Cleansing oneself without the use of running water, and without bothering to remove one's clothing.

Usually when in a hurry getting ready to go out and without a care for personal hygiene.
I can't be arsed having a bath - I'll just have a welsh wash.

or

Kevin is such a dirty minger. He couldn't be bothered to shower so he just had a welsh wash with a dry towel
by Rob Marsden August 29, 2007
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