upon learning that his flatmate genuinely believed that highland terriers roamed free in the highlands of scotland jay could be seen expressing his sheer disbelief using the bullimore
a facial jig that shows huge disappointment or embarrassment, similar to a [facepalm] but only to be used in extreme cases
"upon learning that his flatmate genuinely believed that highland terriers roamed free in the highlands of scotland jay could be seen expressing his sheer disbelief using the bullimore" What is the definition of "bullimore"?