Slejje means a female person who takes a lot of dicks in her wizard sleeve from lots of people, in a short period. of time. The word is sometimes abbreviated with "SL" This isn't because they are hookers, or something. They do it just for fun. Just to satisfy their internal lusts....
Sexjewgly is simply this - Sex + Jew + Ugly = Sexjewgly.
You see, it originated in the northeast Philadelphia region where many Jews live. It is used to describe a middle aged, hook nosed, yet unbelieveably sexy Jewish man. Who knows what the attraction is, but only Russian girls and over sexed teenagers use this phrase. You can see it grafitied all over Roosevelt blvd.
A famous example is Tim Roth, who is actually not Jewish, but his name and nose make people believe it. Anyway, he is a famous Sexjewgly.