Dictionary.com
definitions

drat

[drat]

verb (used with object), drat·ted, drat·ting.

to damn; confound: Drat your interference.

interjection

(used to express mild disgust, disappointment, or the like): Drat, there goes another button off my shirt.

RELATED WORDS

doggone, dang, curse, darn, excoriate, expel, abuse, confound, slam, blaspheme, castigate, anathematize, penalize, imprecate, doom, sentence, proscribe, attack, convict, jinx

Origin of drat

First recorded in 1805–15; alteration of (o)d rot God rot (i.e., may God rot him, her, it)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for drats

drat

interjection

slang an exclamation of annoyance (also in the phrases drat it! drat you! etc)

Word Origin for drat

C19: probably alteration of God rot
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for drats

drat

1815, disguised form of exclamation God rot (something or someone).

Online Etymology Dictionary, © 2010 Douglas Harper