The shock that one gets while leaning forward to wipe after taking a dump and finding that the automatic flush thinks you have vacated ..... leaving a soggy ass.
Holy shit - that always happens. Now my ass is wet and shitty - I hate Ass-ter Shock
Or...
Why is that guys pants so wet? Must have been a victim of Ass-ter Shock
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.