Definition of backshot:
(v) :
(Internet slang, colloquial) To engage in anal sex.
(n) :
(Caribbean, Jamaica, MLE, MTE, slang) A sexual position in which one partner penetrates the other from behind; doggy style.
(n) :
(East Midlands, vulgar, dated) An act of anal sex.
(v) :
(Internet slang, colloquial) To be raped anally.
(n) :
(chiefly sports) A shot that sends something backwards, such as a shot that sends the ball behind the player making it.
(v) :
(Internet slang, colloquial) To be shot in the back.