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This expression is very commonly preceded by Wow, which expresses a sort of judgemental shock and outrage. In this usage, wow is pronounced quickly and calmly — as if you're in too much shock to react otherwise. That's why it's so popular with ...much? because in most cases, when we use this expression, we're stunned at what we're hearing. For instance, In the snippet below, Rita can't believe how dramatic and defeatist Christina's being. She finds it shocking.____________
Rita: What are you wearing to Scott's party tomorrow?
Christina: I’m not going to the party. Why should I? Everyone’s just going to make fun of my clothes, not talk to me, watch to see how much I eat and drink, talk about me at school the next day... I think I’ll just stay home where nobody can judge me.
Rita: Wow, victim much? With that kind of attitude, you might as well never leave your room.
Nicky: Hey, wake up. It's Saturday morning. I'm thinking of taking the boat out. Want to come?
Alex: Nah. I'm going to sleep in. There's a show I want to watch at 10.
Nicky: Don't forget it's your turn to cut the grass tomorrow.
Alex: Oh, I paid Andy to do it. I want to binge the new season of my show tomorrow.
Nicky: So you're basically going to spend the whole weekend in front of the tv? Lazy much?
Natasha: This is the first time my baby’s ever been away from me for so long. God, I'm going to miss him!
Nicky: Oh God! Really, Natasha? Corny much? You’d think he was five!
This meme is funny because it presents a confusing situation: the girl in question routinely posts sexy pictures of herself for perfect strangers, but then gets jealous when other girls look at her boyfriend? The sarcastic comment at the end basically means «Don't you find your behavior a little... I don't know... CRAZY?!»
Here, the woman is asking her nosy friend a valid question: «If your life is so great, why do you spend so much of your time being nosy about my life? Obviously, you're jealous of me!»