Wongman is a friend that takes care of the ugly fatty friend or other oriental friend who is with the oriental fitty (usually an 8 or a 9) you want to get with.
The Wongman is also responsible for endorsing and elaborating on any crap you mention to the bird during the evening.
If you say you are a pilot your Wongman is forced to back up that story and any other bullsh1t you tell the oriental fitty.
Will was trying to pull a stunning Vietnamese girl however her cock blocking friend was in the way. Paul the wong man kindly stepped in and chatted up her ugly oriental friend Mei - taking one for the team in the process. This allowed Will to nail her friend.