when someone has an overly emotional response to animals that includes loud pitched squealing, the voice rising 10 octaves, and lack of attention to anything else.
*driving*

Driver: hey look at the bunny

Alyssa: AIEEEE!!! it's cute guys, oh mah godddd. I just want to love it an hug it. AWWW... (goes on for 10 minutes)

Cori: great now we have to wait for Alyssa's petgasm to finish before we can talk again
by pringleee June 15, 2011
Get the petgasm mug.