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1.
Is when the male partner's balls repeatedly smack against the female partner's vagina while perfoming anal sex.
Martha really likes the double doppler effect when I am doing her up the butt.
av Frances Wates 19 juni 2006
 
2.
when both male testicles are placed in the female anus
I gave Sherri the ol' double doppler last night and my balls barely fit!
av dopplehoffers 23 februari 2011