bumster

noun2

1. •
   [before a noun] A pair of very low-cut trousers which reveal part of the buttocks.

   • And he would have relished the juxtaposition of the wedding dress with the infamous bumster trousers that are, as of this week, on show in the Metropolitan Museum. — 2011
2. •
   In The Gambia, a young man who solicits money or favours from tourists, sometimes in exchange for sex.

   • Believe us when we say, the one thing that is most likely to spoil your holiday in The Gambia is constantly getting hassled by bumsters. — 2006