recherchez un mot, comme bukkake :
 
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.
de Frances Wates 19 juin 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!
de dopplehoffers 23 février 2011