He's adorable! Mostly, this leg waving thing is a mating ritual in jumping spiders, but it could also be to ward off other males and, in the case of ant-mimicking species, it's to make it look as if the legs are antennae (which is a whole bunch of awesomeness). In this little guy's case, I think there may have been a female nearby that was hiding from you but the male could see her.
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