Is it spoken English?

[cowboymathu]

I have listened that "How you going?" from some films while someone meets another one after long time. Considering spoken English, shall I use it?

[Tdol]

You'll hear that and 'How you doing'. Some speakers say 'are' almost inaudibly, but other omit it altogether. It's fine in colloquial language.

[Super Sonic]

Originally Posted by Tdol

You'll hear that and 'How you doing'. Some speakers say 'are' almost inaudibly, but other omit it altogether. It's fine in colloquial language.

Is there also "How is it going" or am I just making it up?

[Tdol]

No; that's fine too. There are dozens of variations on the theme.