What in the world just happened here?

Walking into the party, I greeted my old friend with a cheerful 'what's going on' to break the ice.

Late at night, she scribbled down her what-ifs in a little notebook, turning fears into plans.

After the meeting, he kept what-iffing possible outcomes until he couldn't sleep.

After the meeting, she what-iffed every suggestion until the group reached a decision.

Please read the paragraph carefully, then guess what the missing word should be to complete the meaning.

When I opened the door and found my cat wearing my glasses and a tiny hat, I blurted, 'what the eff?'

After the game, his friends dismissed his what-iffery about the missed free throw, but he couldn't stop imagining how different things might have been.

Hey, what it do, man? Long time no see.

What the Devil are you doing in my garden?