Top Definition
Vomiting while having a case of diarrhea.
"Oh my god, last night I was so sick I double rainbowed."

"Double Rainbowing is the worst!"
by travitz west October 02, 2013
1 more definition
when someone goes extremely bezerk over something i.e. double rainbow guy
Guy 1: OMG LOOK AT THE LOW PRICE!!!!! ITS SO INTENSE!!! (**he faints**)
Guy 2: (to guy 3) Whats wrong with that guy?
Guy 3: Oh nothing hes just double rainbowing over the low prices.
by yosemitebearposer September 04, 2010

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