RO 

abbreviation for "Reverse Osmosis." Reverse osmosis is a process in which water is forced to travel through a semipermeable membrane against the concentration gradient by increasing the pressure on the feed side above the osmotic pressure of the solute with the highest osmotic pressure. It is often used in drinking water treatment.

People don't know that the reverse osmosis technology used to manufacture their bottled water does not do a good job removing neutral compounds like arsenious acid (arsenic), even though the companies bottline it would like you to think that it is ultra pure.

RO by Matt Charles February 15, 2005

Ro 

Ro is to "pwn" what "pwn" is to own.

Someone tries to steal your shit and you bitch slap them to the floor...they just got Ro'd

Ro by DRrecords December 9, 2008

ro 

ro is to "pwn" what "pwn" is to own.

Someone tries to steal your shit and you bitch slap them to the floor...they just got Ro'd.

ro by DRrecords December 12, 2008

ro 

a variation of "right, yo", it can also mean "right on, yo!".

I may be a car ho, but you're a mooching hoochie, ro!

ro by Devily January 15, 2003

ro 

slang for the currency Euro used by English speaking people traveling through Europe. Functions much like the word 'quid'.

Four ro?! For a coke?

ro by janet, dammit July 3, 2008

ro 

short for 'right on'

Bro: We just got back from the best vacation ever, can't wait to go back.
Other Bro: ro!

ro by Michael Crawford January 22, 2008

Ro 

Verb. The act of defecating into a woman's vagina for sexual arousal. The male then performs intercourse on the female's feces filled love canal.

"I paid Ro $20 and she let me ro her."

Ro by Bonehead2 December 14, 2008