Nickname and abbreviation for the Russian composer Sergei Rachmaninoff. Widely used in the classical world, as an abbreviation for long names for compositions.
For example, "Rachmaninoff piano concerto #3 op. 30" abbreviates to Rach 3.

Guy 1: I heard you went to a concert in the weekend
Guy 2: Yeah, they played Stravinsky's Petrushka and Rach 2 & 3
by Xyko October 11, 2016
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When you have diarrhea after eating a lot of ranch.
Damn I got the rach after eating too much hidden valley ranch
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often brunette and with green/blue eyes that are massive and often thought to be 'beautiful' by men called arnold. she is also someone with the a strangest laugh that doesn't make any noise, and scares people awaay. shes really annoying and doesnt have many friends which is really unfortunate for her.
her eyes are so rach
by jibbjibb August 26, 2010
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A person who try’s to bring u down who thinks they have depression and who fucks dogs and babies
You rach
by Bid small dick Dave October 22, 2018
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1. An individual who cares not for relationships beyond the realm of the sexual, these people sleep with many partners not caring about anything save for the moment of climax.

2. Rubbish that is not worth the time or effort of paying attention to it, but none the less draws one in. Used to describe unpleasent situations.

3. Physical trash, often scrap metals.

4. Drawn from frag, to slag something is to destroy it, used in cases of technological rather then biological items.
So your wife's been a nasty slag all along? I knew she was trouble from the moment I first laid her.
OMG that Rach is the biggest slag
by sluttism4life February 26, 2010
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she is a best friend to all, a loving charachter and so easy to talk to! you know shes never going to judge u and will be honest with u no matter what. even when she bitch slaps u cuz shes rlly good at it, u cant help but laugh because shes so cute. and also, everyone loves racheli cuz shes smart and beautiful and can read someone like a book and knows exactly what to say when they have a rough day!
that girls awesome. her name must be racheli.
by deeds-xoxo April 8, 2011
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Rachelys is a young pretty girl. She is smart and talented. People love her for who she is no matter what. She will stick by your side no matter what,she will be the bestiest friend you ever had in your life.
I want to be rachelys .
She is everything that you can have.

She is everything you need in your life.
by bihitzizzy December 21, 2016
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