General

I do it to their face. Then they call me a jerk.

I don't have any people in my life that I could smack talk. Except for that one flat mate of my two best friends. She's a twit.

I talk smack behind people I feel disgusted of.

yeuh when they get me upset

In real life if I have anything negative to say, I say it to someones face. Though, I usually don't have a problem
with most people.

I'm too nice/quiet to talk smack about people, but my friends do it all the time (they don't mean it)

only with my friends and it's obviously a joke, we just kind of find it amusing to talk smack to each other.
Now on basil i may be guilty of talking smack to people i don't consider friends but ... yeah

i speak and then I slap them

I only say it jokingly... I never actually talk smack. I do, however, listen to my friends talk smack behind each other

I only talk smack when I'm upset.

What @RitoPls said. My friends all talk crap about each other to me behind each others backs while I just smile and nod. It's really quite annoying actually. They're all good people though...they're just not very graceful when it comes to stupid crap.

Never seriously but I never say I'm just kidding.

... Man, I hope people know I'm kidding when I rag on them.

.... I'm such a bully. QQ