Example 1:
Person 1: When did you become a feminist?
Person 2: Why?
Person 1: Hum, I don't know, look at your last facebook status.
Person 3: Yeah, that's not him. He's been mach-ed.

Example 2:
Person 1: Our producer suggested that our band should play music out of smoke detectors. And we actually went to the mall, bought a bunch of them and spend the day rehearsing Highway to Hell.
Person 2: And how did that work out?
Person 1: Well, what do you think? We've been so mach-ed.

I've been jabbed

Example 1:

Person 1: Did you really write that on your facebook profile?
Person 2: Of course he didn't. He wouldn't have spoken these wise words.
Person 1: Ooh. So he's just been mach-ed.

Example 2:

Person 1: Our producer suggested that our band should play music out of music detectors. And we actually went to the mall, bought a bunch of them and spend the day rehearsing Highway to Hell.
Person 2: And how did that work out?
Person 1: What do you think? We've been so mach-ed.