It means modern day teenager i.e. 14 year old who smokes, 12 year old who gets pregnant every other day.
Guy 1: Did you hear that she got pregnant again?
Guy 2: But she's 10!
Guy 1: I know she's a right feggle.
Guy 2: But she's 10!
Guy 1: I know she's a right feggle.
by Nine300 June 02, 2014