When you are a U.S. citizen, travelling abroad and you are caught by the local authorities with a prostitute of the same sex who has not reached the age of consent by U.S. law.
"Senator Hoffman found out first hand what a Bangkok Bugaboo is; the Massachusetts senator is facing 20 years in prison after being caught having sex with an 11-year-old boy in the Phillipines."
by Brice Guthtree January 15, 2006