To shag indiscriminate chicks without regard for marriage or a long term relationship with a woman.
Popularized by golfer Tiger Woods and his trangressions.
"That Steve is such an a-hole. When his girlfriend was out of town, he was out woodsin with the ladies. What a douche"
Hitting a drive, with 300 yards carry, over woods to a green that has never been driven before. Also, used in reference to a drive over 300 yards. In many cases woodsin may be interchanged with "mossin" except in a golf sense.
"Did I just drive that green?" "Dude, your straight up woodsin."