drainboy 

someone who drains the resources of other people constantly, either at work, money or just by nausing constantly for things that are important to him alone usually

"That fucker is such a fucking drainboy, wish he would leave me alone for 5 minutes"

drainboy by Stanny Peanut September 25, 2006

drainbow 

Person who portrays themselves as a member of the rainbow family,(hippie style)but really wants only to drain you of all your stash

"That dude goes to all the gatherings, but he`s really nothing but a drainbow."
Usually said with contempt.

drainbow by dogdave December 4, 2002

drainbow 

Someone who hangs out with a group of druggies, and mainly uses the group to mooch/sap off their drugs, alcohol or weed.

druggie #1: Oh damn, look, here comes travis!
druggie #2: He's such a drainbow, i mean, seriously, can't he get his own shit?
Travis: Hey guys, what are you doing today?
druggie #1: Smoking soon, then about ta go drink.
Travis: Oh, sick let's get on that, pass me that blunt!
druggie #2: ..............

drainbow by KKAB April 18, 2008

drainbow 

Pot smokers that hate the world. Former republicans that hold on to old ideals but get high enough to watch day long re runs of sponge bob , sport tie dyes, but never get satisfactory returns on their habits or business endeavours.

" I thought Mike was a hippy rainbow person, but he really had me fooled with all that tie dye, turns out he's a drainbow, he got high and complained for 4 hours on the couch about how his vending machine business failed, but who buys panties from vending machines anyway?"

drainbow by AVsearch May 15, 2018

Drainbow 

The slang word for describing an event where MOST people from all backgrounds go to focus on world peace and healing, but where others just like to drain someone of their energy .. which is known as a rainbow gathering.

"Hey! Didn't I see you at rainbow?"
"Yeah, I was at Drainbow... That shit wore me out..."

Drainbow by DesertPhoenix87 December 21, 2016