blessed assurance
noun/ˈblɛsɪd əˈʃʊɹəns/
Etymology From blessed + assurance, in reference to the 1873 hymn “Blessed Assurance”, with the second element taken as a minced oath for ass.
1
Southern, US, Euphemistic buttocks, ass.
- I'm just going to sit here on my blessed assurance until Jesus comes.