Green’s Dictionary of Slang

blow me! excl.2

[older use var. blow it! excl. ; late 20C+ blow v.2 (1c)]

(orig. US) a dismissive excl.

[UK] ‘Of All The Blowings On The Town’ in Flash Chaunter 5: But blow me if I care a d--n.
[UK]R. Barham ‘My Letters’ in Ingoldsby Legends (1847) 355: I’ll burn them precious stacks down, blow me!
[US] ‘The Rat-Catcher’s Daughter’ in Bryant’s Songs from Dixie’s Land 15: In love I’ll constant prove, and – blow me if I’ll live long arter.
[UK] ‘The Little Crossing-Sweeper’ in ‘F. Anstey’ Mr Punch’s Model Music Hall 82: No, blow me if I can do it, for I feel my eyes are all twitching.
[US]G. Sikes 8 Ball Chicks (1998) 80: Handwritten replies decorated every available inch: fuck you, blow me.
[US]W. Gibson All Tomorrow’s Parties 226: The still, small voice of mortality. Blow me, Laney tells it.
[US]C. Hiaasen Star Island (2011) 8: ‘Thanks for nuthin! ‘Blow me’.