i) The visible portion of a woman's vulva, from behind, when she bends over.
ii) The amount the vulva protrudes (sticks out) downwards when a woman bends over.
iii) Cameltoe, as seen from behind, when a woman bends over.
Women who have a plump vulva with fleshy labia have a lot of underhang, while women with a flat vulva and lean labia have very little underhang. All the above definitions apply to both clothed or nude women.
The undersound is a stretched out kick (8step) used in newer Hardstyle songs. It is basically a Hardstyle song with a slow and very heavy bassline. The idea was brought forward by DJs Technoboy and The Ruffian and it is the newest addition to the evolution of Hardstyle music.
#1: Technnoboy meets Ruffian - The Undersound #2: Headhunterz - Rock Civilization (Technoboy's Undersound Mix)
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.