Downhill racer
When a woman lets two men ejaculate on her breasts, usually a D size or larger. They then race their ejaculate to see which one drips off first.
Chris: She was round the back of the pub, giving em a downhill racer!
Downhill Racer
Sex act involving a person wanking two men simultaneously.
She gave Steve and Alec a downhill racer in the bathroom last week
downhill racer
some one over 40 how still rides a race bike
yep im a downhill racer