In Cantonese, a person with androgenous genetalia. Usually used as an insult, but is also traditionally used given as a middle name to children when they are born with the condition, as a warning to future sexual partners.
(Hot girl running out of the bedroom at a party) "OMG he dropped his pants and he was so Sen Wei!"
by the Mad Shatter April 26, 2005
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Wei Sen is the type of friend that is a complete asshole but will always be there for you and can always help, he is known for having a big ego, but nothing can make him drop it. Some might consider him to be passive but he only uses his strength, skills and anger when it is very much needed.
Greg:Who is that?

Jordan:That's Wei Sen he's so chill and so cool.
by _Gatman_ March 18, 2018
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