A hot girl, often referred to as a fine or fresh piece of cabbage. A common phrase is "I'd farm that cabbage", used the same way one would use the phrase "I'd tap that". There is also "rotten cabbage" (an ugly chick), "bushy cabbage" (girl with nice boobs) and several other cabbage and farming-related metaphors.
Bobby: Do you see that nice fresh piece of cabbage over there?
Luke: Yeah, I'd farm that
Bobby: Let's go hit on her
Luke: Sure thing bro