Definitions
1.nounA woman, especially an old woman; especially one regarded as fussy or mean or a gossipy busybody.
2.nounAn attractive girl.
3.nounAn Irish maidservant.
4.noun(by extension) An Irishwoman.
5.nounA name used in calling a hen or chicken, often as "biddy-biddy-biddy".
6.noun(often in the plural) bitch, girl, woman, especially one that is promiscuous"He's got it made, hanging around with the bitties all the time."