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1.
That particular kind of humor where, you know, you feel awful for laughing but it's so freakin' funny. Hysterical + terrible = hysterible.
OMG that midget porn was hysterible! I couldn't stop laughing, even though I know I am going to hell for watching it.
by CapnWeasel December 05, 2008
 
2.
It's a good thing actually sort of. It means slightly evil, with a sense of humor.

Hysterical/Terrible
Kate is so hysterible! She was madly texting right under her bosses nose during that meeting.
by JRLewis August 16, 2011