Blind doctor

n.

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Any dipterous fly of the family Tabanid, that stings horses, and sucks their blood. Horseflies.

In use

Dat durty little blind doctor bit me right on the nipple through me geansaí an' now 'tis like a big belly buster!

Let Lawrence Muck translate it to posh English for you
Lawrence Muck

Hello. Lawrence Muck, at your service. Would you like me to translate 'Blind doctor' in use for you?

That filthy little horsefly bit me directly upon the nipple through my jumper, and now it resembles an enormous blackberry!