(thing) by muted Thu May 17 2001 at 21:21:00
According to the instructions for the 1959 edition of Son of Mad Libs by Price/Stern/Sloan, "an exclamation is any sort of odd sound, gasp, grunt, or outcry not caused by gastric disturbance.

"Examples: Wow! Ouch! Oho! Wowp! Ick! Gadzooks!"

I like it!