Acronym for Sweet Wholesome Gal/Girl. From Ryan Higa's song, S. W. G.
A sweet wholesome girl basically isn't a slut.
Can also be abbreviated SWG, S.W.G. or S W G.
Wagwan - Translated to "What going on" or "Whats up" usually used if you are a so called "roadman" (a person who usually goes round on a bike wearing all branded tracksuits smoking weed and drinking alcohol). A popular phrase people use with the word "Wagwan" is "Wagwan piff ting" - usually meaning "Whats going on hot (sexy) one"