To move from the pink, to the brown, when making the sweet sweet sechzor.

Or if you'd like it a bit clearer:

To go from vaginal to anal intercourse
Man A: Dude, I tried something new with my girl last night.
Man B: Oh yeah, what's that then?
Man A: Well, I went from pink to brown.
Man B: derailed!! Fair play matey.
by Sid P June 13, 2007
To derail someone means while having sex you slide up off the penis that is placed somwhere inside the your body.
I was getting slammed and was tired so I derailed with no hands and went to bed.
by Ayy Finn November 04, 2010

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