Just say it really fast and most of the time they will say "what". If you want to change it to "homo say huh" or if the persons name is Bob you say "Homo named Bob?"
Me: Homo Say what!?
Peter: What?
Me: Haha.
Peter: -.- douche.
Me: yeah I know.
When somebody say's something you didnt catch, hear, understand or are disgusted with and would like them to repeat it so you can smack them the hell up!.
Or what one would say after watching the music video for Radiohead's 'Just'.
Say what?
You really need to watch the radiohead video for 'Just', thats a proper Saywhat?