The act of preforming a queef powerful enough to create a physical rainbow cloud from your vagina.
Steve: I won't go unicorn deep in a girl ever again
Tod: Why's that Steve?
Steve: Last time I did, it hurt her so much she had an agressive rainbow queef
Tod: Nasty!
Going so deep in a pussy that it feels like a unicorn's horn is penetrating your ovaries whilst preforming an aggressive rainbow queef.
Fred: Man, I think Stacey is going to brake up with me.
Jo: What!?! Why?!yy
Fred: Well... I was having sex with her for the first time and... I... Have a big... Cock and I went unicorn deep. She still can't walk dude.