Freechaku

Freechaku means freestyle nunchaku.

Freechaku is a blended word (also known as a portmanteau word), formed from parts of two other words.

In this case, the first syllable of freestyle replaces the first syllable of nunchaku.

Two examples of other common blended words are guestimate (guess and estimate) and chillax (chill and relax).

"Portmanteau" originally means "suitcase". It was a common phrase in England in Lewis Carroll's time. As Humpty Dumpty explains to Alice (in the book Through the Looking-Glass), "You see it's like a portmanteau—there are two meanings packed up into one word.