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!
Por El Chin Chon 06 de febrero de 2009
1 more definition
to smile out of happiness while crying of sadness
she had lost all hope, but love in friendship made her dawn a rainbow smile
Por audiodecoy 04 de abril de 2005