Cal surf means California Surfing. Surf culture was first popularized in Southern California including the woodie bikinis and other beach wear such as boardshorts or baggies.
I would assume that the term migrated from the term "Channel Surfing", in reference to wandering through television channels. The origin of the computer term to surf the net from what i can work out comes from the term the internet as a net is cast to catch websites which have been placed on the internet and nets are usually meant to be cast in water so it seems logical that this is where the term derives from .
No, it's in Illinois, if you meant California :)
It depends on which Cal. you mean, but it's most likey the cooking term. Cal. stands for calories.
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That is not slang - 40 cal stands for 40 calories, which is a nutrition measurement.
surfing means a person or a boat is riding down a wave
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