>>I've heard of "club 100" - guys over 100kg. You can oder "kilo i sifon" - a liter of white wine and a siphon bottle for soda, to make a spritzer (*). Your height may be "meter and sixty" (160cm), "meter seventy" (170), or "meter and a razor" (below 150), "dvometraš" - two-meter-guy. If you're extremely lightweight, you "ain't got fifty kilo with bed" (since you like brevity: nema pedes kila s krevetom). When I was a kid, they sent me to grocery to buy "pet deka kvasca" (5 decagrams of yeast). All short and nice.
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>I've never heard the metric "deca" or "deci", or "hecta" being used at all.

"Deci" is short for deciliter, and it's quite a common measure, for both drinks and recipes. "Dek" is 10g, again used in recipes or when buying food - you buy "20 deks of ham sausage", though "200 grams" is also quite common.

Tough, even with metric you can get into confusion. We were once shopping in Trieste ('76, I think) and while waiting for a bus to our side of the border, we noticed some nice cheese in the shop window, and the price was about 20-30% below price at home - ah, must be those EU subsidies. We still had some money, so we went inside and decided to buy the whole ball of it. The total was exorbitant. The price was per 100g, not per kg :).

>Wine and booze here is sold in litres, or in "bottle" size (c. 675 ml?). I enjoyed being able to buy a 2 pint bottle of Jack over in the States; although less than a litre the bottle looks bigger!

A bottle should be 0.7 l for wine - I think that's standard. They sell them so even here. Though that's the size for better wines; your regular cheap wine would be in liter bottles, though I've also seen them in 2l bottles at times.