Your friend. Dr. Whatshisname.

I was hoping wed get whatshisname to fix that shower.

And then one day, somebody will ask, Whatever happened to whatshisname?

I've just seen Lonesome whatshisname on the television and I like him.

Of course. There was that case of that fellow, whatshisname, Adolph Beck.

That... business before, when that tall guy, whatshisname, was tryin' to bait me?

I looked up just in time to see this fellow, whatshisname, fall out of the car.