Characters
Ooh, gang, didja hear that? A bonus day of class plus Cordelia! Mix in a little rectal surgery and it's my best day ever!
— Xander

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker piles unpleasant prospects together and sarcastically calls the result a perfect day. The exaggerated addition of surgery makes the complaint about class and company unmistakable.
Context reviewed