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1.
to smile out of happiness while crying of sadness
she had lost all hope, but love in friendship made her dawn a rainbow smile
de audiodecoy 4 avril 2005

Words related to Rainbow smile

puke regurgitate throw up tits vomit
 
2.
A euphemism for throwing up.
Dude, this kid in my class got sick and totally rainbow smiled alllll over the room. He couldn't even make it to the bathroom!
de El Chin Chon 6 février 2009