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1.
A slang meaning that means that a young girl has pubic hair (hence grass) around her pussy (hence on the wicket).

Therefore the girl is old enough for sex (hence lets play cricket..)
Mate, if there is grass on the wicket, its good enough for cricket.
by ChefsPop May 03, 2004
 
2.
A younger female who looks capable of sexual intercourse
grass on the wicket, lets play cricket
by greg April 06, 2003