Describes da varying degrees of hard-on dat a male golfer gets from watching a hot busty number lean over to tee up a ball, revealing her luscious cleavage for him to see; da more of her ample tits dat get revealed to his lustful gaze dat way, da higher his "wood number".
I went through a complete range of "1, 2, and 3 woods" while Tiffany was playing a round of golf wif me; finally I couldn't stand it anymore, and so I yanked down her golfing shorts and took her right then and there in da middle of the putting green!