I don't believe it! Excited exclamation of disbelief or excitement.
Interviewer: "Well Mr Jones, everything seems to be in order and we are delighted to offer you the job"
Mr Jones: "Well spank my ass and call me Sally!"
Interviewer: "......"
by DougieT May 26, 2006
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Used when someone is shocked because something they didn't expect happened.

Can also be used when someone thinks they screwed up.
Yeah, we've got a test tomorrow. Didn't you know?
Well fuck me in the ass and call me daddy. I'm so screwed.
by BitchBitch666 November 20, 2018
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A phrase of utter and complete shock and surprise in the most extreme sense.
Bro: Hey, Donald Trump won the election!
Other bro: Well, fuck me up the ass and call me stupid.
by ZenTam April 18, 2018
Get a fuck me up the ass and call me stupid mug for your dad Paul.