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1.
A hopeless and usually homeless young person. Disdaining gainful employment and reluctant to contribute to their own or anyone's needs.
The town square was usually full of shrubbies with their hands out and sitting around lazily.
by Hornby Dude July 12, 2006
 
2.
The female equivalent of a man's hard on, known as a woody; when a woman is sexually excited, she doesn't have a woody - she has a shrubby.
I got so wet for you, baby, I totally have a shrubby.
by Firk August 26, 2013