Dirty Butterfly

The Act of ejaculating onto a woman's mustache (or ''Caterpillar'') thus allowing her to wipe away the applied semen, similar to a metamorphosis of a caterpillar to a butterfly.

Dan: I blew it all all over Susan's hairy upper lip.

Tony: Can you not say that about my mom!?
Dan: Fine but theres nothing wrong with giving a girl a Dirty Butterfly.

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