When you decide to have sex with your lover, who is unfortunately (for both) menstruating. Also, she has been plugged with a tampon, strings all a'danglin'. During intercourse, the tampon appears to slide out, much like the horn of a unicorn.
A potentially sedate weekend in Daylesford may have been caused by an awkward round of "Fucking the Unicorn"...
This phrase is mainly used by women who have a certain hatred for ass involvement. The Good, The Bad and The Ugly mainly entails:
The Good: pussy eating The Bad: salad tossing and The Ugly: all "nicely" rounded off with ass sex
Carol:So how was last night with Darren???
Ann:Horrible, tried on The Good, The Bad and The Ugly!!!