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.
ayon kay Frances Wates ika-19 ng Hunyo, 2006
when both male testicles are placed in the female anus
I gave Sherri the ol' double doppler last night and my balls barely fit!
ayon kay dopplehoffers ika-23 ng Pebrero, 2011