I have two questions. In English, if you shorten kilogram to kilo is that wrong? Secondly, if you leave off the "of" in "of meat" is that wrong?
Kilo is generally accepted for kilogram in everyday speech and in casual writing (such as a email between friends) as well.
You would nearly always include "of" when speaking or writing. The exception might be when writing out a list of supplies, or a recipe, e.g.,
For our camping trip, we'll need: 3 kg beef 1 kg sausage 1kg butter 2 kg bacon 1 kg coffee
But that's a pretty specialised case. You will never go wrong if you include "of."