pronounced "Glee-shay": occurs when a person acts in a very unsurprising, predictable or otherwise overdone manner in regards to musical or theatrical performances, or else acts like one of the characters from the television show "Glee"
"For Katie's choir audition, she sang 'On my own.' Such a Gleeche! Who does she think she is-Rachel Berry?"
by dramaqueen713 January 11, 2010