wow. 19 years of humorless bliss....
Just kidding - really.
Obviously, different folks have different senses of humor. Wry is not one of yours, but is fairly common, which is why so many of us are okay with SWMBO.
Wry understands that SWMBO is tongue in cheek, not serious, maybe even funnier when stated seriously...
Wry is sarcasm that is not mean-spirited at all, but appreciated in good company. the dictionary calls us distorted, perverse
in that the meanings we take are distorted from the original intent of the word. SWMBO is a perfect example. We don't take it as a directive, only as a reference to our significant other.
I'm guessing British humor leaves you scratching your head - but to each his own.