A D.C. coloquial similar to Jawn or Jant, though probably stemming from Joint.
Used as a noun for nearly anything and everything. Usually followed with an adjective like Tight (Tizight, Tiggity Tight).
Them jongst is tight! (compliment, e.g. shoes)
I'ma get that jongst next week. (purchase)
Where'd you get that jongst?