An expression of disbelief, as in "I find that extremely unlikely". A
South Wales linguistic expression, especially associated with
Swansea.
“I reckon
Wales will beat England in the
next Rugby
home nations” “Cow off, they’ve got no chance."
or
“Wembley stadium should be completed in 12 months” ”Cow off, there’s enough litigation to last for the next 12 years”