think the sun shines out of someone's arse

• think the sun shines out of someone's ass (US)
• think the sun shines out of someone's backside
• think the sun shines out of someone's butt

think the sun shines out of someone's arse (third-person singular simple present thinks the sun shines out of someone's arse, present participle thinking the sun shines out of someone's arse, simple past and past participle thought the sun shone out of someone's arse or thought the sun shined out of someone's arse)

1. (UK, Ireland, Australia, New Zealand, vulgar, figuratively) To think so well of someone that one cannot imagine anything wrong with them.

• Also used reflexively: "to think the sun shines out of one's arse", synonymous with think one's shit doesn't stink.

• “think the sun shines out of someone s arse” (UK) in Macmillan English Dictionary.
• “think the sun shines out of someone s ass” (US) in Macmillan English Dictionary.
• “think the sun shines out of sb s arse backside”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.

• have one's head up one's ass