An English Colloquialism?

I'm trying to forget my embarassment at forgetting to change phasor angle when I went from conductance to impedance.

That, my friend, is unforgiveable!

_{(Walks away muttering about the continuing downgrade in the education system)}

I would guess that this is a genteel and oh-so-polite way to demand the kissing of one's own bottom. (Just splitting the difference there so as not to offend too many bluenoses.)

Or should that be brown-nosers?

When I went to the armed forces, my parents told me: "we have to explain you one thing, Santa, that's us".