1) A word of Finnish internet slang, such as "fab" (fabulous) in English.
2) However, in Finland "ihku" also stands for a specific kind of wart, which can be found from the tip of horse's penis. Very little of the people using the word know this, regretfully.
1) "Ooh, I love Adam Lambert! He's just ihku!"
2) "Ugh, my horse has an ihku again. Looks a lot like Paris Hilton, too."