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1.
When you shoot diarrhea, in a rainbow-like arc, onto your partners chest.
I was going to fart on my wife, but totally shot her with a gravy rainbow.
by Go Badgers April 17, 2011
 
2.
nonsense term describing something (person, place, or thing) considered entertaining and 'cool' despite and largely because of any or all of the following: ridiculousness, irony, inanity, and catchiness/danceability

- grew in usage rapidly in arts and hipster scenes from the March/April 2011 video meme "Gravy Rainbow" from the music video of the same name by New Zealand Electropop artist Disasteradio
Mister Sunshine is within reach /
Girls on the beach /
Well all they want is a Gravy Rainbow /
They do the Mashed Potato on the Gravy Rainbow
by Hipstelectro March 27, 2011
 
3.
N. (grAH-vee rayn-bO)

The fecal mustache that is created when a person performs fellatio on their partner after their partner has pitched during anal sex (Ass-to-Mouth).

Although possible in heterosexual encounters, the term Rainbow indicates that it is primarily a homosexual term.
Girl, you've got to get an enema before I poke your keister... you've got a Gravy Rainbow.
by Ribaldo Givera July 25, 2011