Iku is “Go” in English and means to proceed, move, or walk towards a destination.
Iku also represents the continuation and progress of an action. For example, Yasete Iku means “Getting lose weight.”
Adding umaku before iku means “go well”,Also, “go wrong” is “Umaku ikanai (うまくいかない)”.
Meaning: Pass away
Although not often used, Iku has the meaning of passing away.
“Seikyo” is used when mourning someone’s death. However, it cannot refer to a relative’s death.
Iku-Iku as a slang expression
IKU as a slang expression may be the most important phrase for men and women. IKu means to have an orgasm and is used by both men and women. Iku-Iku is a combination of Iku and means I’m coming! I’m coming!
Iku-Iku is often used in everyday conversation. For example, are you coming to the party today? “IKU IKU!”