adj. Tasteful, genteel, and not in any way wedged in an ass.
Real citation: "Trish pulls Molly's pants down to reveal very non-thongish 'granny panties'!"
(Adam Kohen, July 4, 2002, http://groups.google.com/group/alt.pro-wrestling.wwf/msg/81a99def8bb67443?hl=en&)
Made-up citation: "Even in non-thongish attire, I am quite fetching, according to nine out of ten dentists."