Green’s Dictionary of Slang

Pete n.1

[1920s+] used in a variety of phrs. as a euph. for Christ/God.

In phrases

glory be to Pete

[1920s+] (Can.) a mild oath.

honest to Pete (adv.)

[1910s+] (US) honestly, sincerely; also as adj.

in the name of Pete

[1910s–50s] a mild oath.

what the Pete

[1950s] a phr. used to indicate one’s incomprehension.

In exclamations

for Pete’s sake!

see separate entry.

for the love of Pete! (also for the love of Pete and Alf!)

[1920s–30s] a euph. excl. of exasperation or surprise, for goodness’ sake!