- the hollow under the arm where it is joined to the shoulder; "they were up to their armpits in water"
- The cavity beneath the junction of the arm and shoulder; Somewhere or something considered foul
- n [Aussie Slang and Phrase Dictionary 'Slum, bad area'; RHHDAS 1968] n Vilest location in a given area 2001 Aug male at store in Peach County GA Tumorsville is the armpit of Byron.
- dirty, unappealing place.