Question: *RSVP* literally means "Please respond", however it seems to have turned itself into a noun in common usage:

> 
> "What's your RSVP for the party?"
> 
> 
> "I'm attending"
> 
> 
> 

Is it acceptable to refer to a person's attendance status as *their RSVP* ?

Answer: 
It's not their attendance status per se, it's their response. It's acceptable, if uncommon, colloquial usage. I'm more used to seeing *RSVP* used informally as a verb: 

> 
> "Have you RSVPed yet?"
> 
> 
>
I believe that these extended uses indicate an embarrassing ignorance of the meaning of the phrase. If an invitation ended with "please respond," would you say "I please responded," or "I'm waiting for your please respond"?