Originally from the TV series "Queer eye for the Straight Guy" meaning to spice up ones image/ make-up/ clothing and style. To make your appearance more attractive and eye-catching to others.
Don't you just love my new style, I decided to zhoosh it up and my self-confidence has also had a make-over!
Polari term that means to fix or tidy, usually in reference to hair or clothing.
Kyan told John to zhoosh his hair after taking a shower.