1. An aquatic species of the beluga narwhal race that inhabits the nether regions of the nordic sea. An ishboo is a rare and beautiful species that has a large tusk used for reproduction.

2. An endearing term used amongst friends to indicate their fondness of each other.

3. Used to replace other words such as fuck, shit and other "cuss" words.
"Move out of my DAMN way you ISHBOO!"
by Ishboo June 28, 2006
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