The term means hydroponic, as in hydroponically grown weed.

There are male and female marijuana plants, when you let a male release pollen onto a female plant the female will produce seeds in her buds. If there are no male plants around the female plant will still produce her buds, but there will be no seeds inside, which gives the plant a lot more energy to produce THC. This is commonly referred to as "hydro", though to grow seedless bud you wouldn't necessarily need to use hydroponics.

Hydroponics systems work by filling a bucket filled of hydro ton (airy rock pellets) with nutrient enriched water for a few seconds every few minutes. The plant uses little energy to grow roots as it doesn't need to expand to get nutrients it needs, and can use it's energy to grow leafs and buds.
AK-47, White Widow, Black Widow, Purple Haze, are all hydroponically grown seedless bud.
by MustJustBe December 24, 2006
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Some damn fine pot, hydroponically grown to suit your needs.
Money rolls, cars and clothes, that's how all my niggas roll

Burnin' dro, 24's, that's how all my niggas roll
by TI November 3, 2004
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An Ethiopian ritual which involves removing the skeleton of feline autrapitus (cat) and using the skeleton to create a spirit neckless.

Droing is also a slang word in Ethiopia and other nearby countries to name someone who is disrespected. This originated when Ethiopians would force people to eat the remains after the skeleton is removed (boiled in saklit) and laugh at them when they bled out of their ears because of the saklit.
-Want to see a movie friday night?
+No I am droing friday til sunday morning. -Sucks.
by PetetheCheap34 October 21, 2008
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dro is a slang term for good weed that was cared for and had good genes, as oppose to the shwagg you'd get from a ditch. dispite what you may have learned from rap, hy"dro"ponics is not some magical plant growing system that foolproofingly produces super plants. There are two things that make weed good: its genetics and the love from the caregiver. there are many techniques, nutrients and plant training methods for good weed production (humans have been growing it for over 5000 years). organic is my favorite, you can do organic hydroponics,aeroponics, or soil. this produces what some call " connoisseur cannibus."
by cannibusconnoisseur August 20, 2010
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A type of marajuana that is in a league of its own. The 'high' achieved is totally different from the other types of weed. It has a higher potency than any other grade of harvested weed. Dro is hydropnically grown, indoors, in a medium other than soil; with controlled light, temperature humidity, and precise amounts of nutrients delivered directly to the root system. A pump circulates the nutrient rich water constantly over the roots, allowing the marijuana plant to increase its amounts of THC exponentialy giving it a white, fuzzy appearance and a very high potency.
There are many grades of marijuana: Shwag, regalatti, mids, sinsemilla, dank, super dank... and then theres dro.

Me and my peeps got sooo stoned smokin' that dro, we couldn't even drive much less get off the couch.

by J u l e s March 14, 2007
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Ok well here's the NO-BS definition now: slang for marijuana grown with the aid of hydroponics. Nobody can tell the difference between good hydro and good organically grown after it's been cured, so all those people rappin' about smokin it with their "niggaz in da hood" are morons. Remember, most rappers used to be idiot drug dealers anyway.
That's some good dro (and that's as far as any example should go)
by n0thing February 26, 2005
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