Another word for g-string, thong style underwear. Originating in Japan. Often confused with t-bag by foreigners not used to Japanese pro-nun-see-A-shun.
You should wear your t-backs or you'll show your panty lines
willygonbarmy is just like saying "man u crazy person"
willy and barmy are both wrds to describe silly
Guy:lets jump of this cliff
Girl:noway, u willygonbarmy