1/. a girl, chick, woman, female

2/. (UK) a stint of time in a correctional facility (jug). Originally used by Sixties Cockney gangsters and Eastenders types.

Brick of drugs usually Cocaine

slang (eng.) young woman

36 ounces of cocaine

When you flip someone off, like this:
........................./´¯/)
......................,/¯..//
...................../..../ /
............./´¯/'...'/´¯¯`·¸
........../'/.../..../......./¨¯\
........('(...´(..´......,~/'...')
.........\.................\/..../
..........''...\.......... _.·´
............\..............(
..............\.............\

n.
1. An individual who is stupid, foolish, careless, idiotic, moronic, retarded, or just plain dumb.

2. A profane gesture in the form of giving the middle finger.

3. A feathered vertebrate that has wings and lays eggs.

interj.
Used to express dissatisfaction.

See Also: bird move

(Brit) Across the midlands and other regions of England, a "bird" merely means a female of the species. It has no other, more sinister connotations.
The plural is, naturally, "birds", but you wouldn't be stupid enough to call it a flock.