Help Identifying Kung Fu comedy from late 70s or 80s?

I am trying to identify a Kung Fu comedy. It was on HBO in the 80s. I remember a specific scene that I thought was really funny. The asian main character was in the inner city and encountered a gang. He pulled out a "jive translation manual" and started talking jive to the gang. One of the gang members said "What did you say about my mama?" And another gang member said "No man, I know where he's coming from" I also remember that the main character was supposed to throw a fight at the end, but then was told it was ok to win and knocked the opponent out in a ring. Anyone know this movie?