Isaacishish 

3. To use suffixes in an excessive way.

P1: "This soup is full Kristerrificishness goodness"

P2: "Don't be so Isaacishish."

Isaacishish by Leroy March 19, 2003

Isaacishish 

1. To show signs of acting like Isaac, especially in science-fiction areas, during everyday conversation.
2. The act of repeatedly impressing your friends with witty banter, much like an episode of Gilmore Girls or a person who is Kristerrific.

Oh, that Darvil cracks me up! He is so freaking Isaacishish!!

Isaacishish by Martha March 19, 2003