The act of when a girl is sucking on your penis and you unexpectedly jizz all over her face
I gave her her great California surprise
the act of gagging your drunk partner with your penis until they vomit on said penis and then quickly shoving your penis into your partners vagina/anus.
"dude i got Cindy so drunk i gave her a gnarly California surprise."
When one surprises another with their cut off testicles and hides them in ones possessions
Yeah I have Jessica the California surprise now I have a restraining order against me