drat - What does it mean?

Verb

That dratted cat's been in the vegetable patch again.

Whereat Mr. Fussy Fumer, gravely displeased, hastens home and writes an anonymous letter to Mrs. Gamp, who joins him in dratting the 'imperent upstart,' and denouncing the incompetence of the police.

And should you be one of those conventional persons who thinks of parasites as abnormal or perhaps goes so far as to drat the varmints, you may be surprised to discover, as I did, that parasites live both inside and outside most organisms in all the kingdoms, which makes parasitism thoroughly normal