The most badass undercover cop in whole Hong Kong.
Said to be Jackie Chan brother, Wei Shen goes around kicking people in the face and jumping from vehicle to vehicle.
"Dude, did you see that ? My friend got kicked in the face by a Wei Shen wannabe oh SH-"
by Earthykiller July 15, 2014
Going to the toilet during a lesson, in an exam or when you shouldn't in school or college.
John: Miss, can I go to the toilet?
Teacher: Sure
Emily: where did John go?
Peter: He's doing a wei shen
by Maths Genius February 3, 2013