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.
Sex + Jew + Ugly = Sexjewgly
Sexjewgly is my Anti Drug