In the socialist fantasy world it is putting the means of production in the hands of the community so that everyone shares equally. In reality it is taxing people who are productive and redistributing the proceeds to everyone else (with an extra share or three going to those who do the redistributing).
Now you define it for me to the best of your ability.
I define it as greedy lazy people that are not willing to work hard or save for retirement an force those who do to make up the difference. Basically every liberal or a cheapskate conservative that hates Mexican migrants but loves cheap produce.