Top Definition
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!!
by Martha March 19, 2003
3. To use suffixes in an excessive way.
P1: "This soup is full Kristerrificishness goodness"

P2: "Don't be so Isaacishish."
by Leroy March 19, 2003
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