Ah, Guppie! Snapple is kind of a fruity drink--supposedly, according to their advertisements, made from "the good things in life," meaning real fruits, etc. I don't know how true that is. But when my dad was diagnosed with diabetes last year, we had to get him off all the sugary drinks. And we switched him to a diet Snapple, which he likes and I started drinking it, myself!!
As for a piker, it's sort of slang word for someone who does things minimally. For instance, here you are with your 'Martini and ice cubes' and I'm drinking a fruity drink!!
Language is a funny thing, isn't it?!!
Love,
MB
xxx