A kid who is not cool because he does not say hi to his friends friend.

pertaining to much much habitual sex, paralleling the chorelike and promiscuous nature of 'watering' organisms pertinent, but not limited to, the kingdoms plantae, protista, and fungi.

To drink alcohol and smoke weed

Urinating outside , for the benefit of the plants who don't get enough water

A sexual reference used when you don't want to be too obvious.

its to tell someone to get off your case and go do what they are suppose to do, to mind their own business

Usually used as an excuse when somebody wants something done.